[That Japanese Man Yuta seems to say](https://www.youtube.com/watch?v=kN-
fQBIZhz8&t=297s) じゃあね (jaa ne) is actually LESS formal / MORE casual compared
to じゃあ.

[![enter image description
here](https://i.stack.imgur.com/GL0iC.png)](https://i.stack.imgur.com/GL0iC.png)

  1. Btw, is the n supposed to be in red too?

  2. What's up with that MORE syllables are actually LESS formal / MORE casual? What are other examples of this?

cf [Is お needed before 誕生日おめでとう (Happy
birthday)?](https://japanese.stackexchange.com/questions/29034/is-%e3%81%8a-needed-
before-%e8%aa%95%e7%94%9f%e6%97%a5%e3%81%8a%e3%82%81%e3%81%a7%e3%81%a8%e3%81%86-happy-
birthday)

お誕生日おめでとう is more polite / more formal / less casual compared to 誕生日おめでとう
right?
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politeness formality casual particle-ね
When are less syllables or words MORE formal / LESS casual? Eg Goodbye: じゃあね vs just じゃあ
I'll focus on -ね here. I would say it makes the utterance more intimate rather
than more casual. Similarly to じゃあね vs じゃあ, おめでとうね sounds more intimate than
おめでとう.

Politeness can sometimes be explained with high vs low status but it can also
be explained with distance. Here, it's more about distance. Presenting
yourself too close to a colleague can be inappropriate (which appear to be the
context in the video).
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The answer to your sub question 1 is yes. The ne at the end should be red, not
just e. I'm sure it was just overlooked.

I have to forewarn you that my answer for the main question might be anecdotal
but I think it is a very plausible explanation. Less syllables could mean more
polite when an expression that added an attitude to the phrase is taken out.
Those expressions are called 終助詞{しゅうじょし} or語尾{ごび}

Japanese language has many ways to end the last word of a sentence to imply
status, demand, empathy, surprise, attitude or the intention of the phrase.
よ、ね、か、じゃん、and many more.

Some 語尾 could be thought to be an attitude modifier. Take an example below

  1. すべて開{あ}けてください
  2. すべて開{あ}けてくださいよ

The former politely asks you to open all (of whatever they might be), nothing
else. How about the latter? Is the latter less polite? If you talked to a
complete stranger that way. The words might be polite but よimplies a pretty
strong demand whether pitiful or forceful, so you'd be viewed as pushy or
impolite. When よis used this way (demand/command) often involves an attitude
or pleading. So naturally, taking out よ makes it more polite. More correctly,
taking よ out makes it less impolite.

Similarly below,

  1. これは水{みず}？
  2. これは水{みず}か？

The first isn't very polite but not very impolite either. As for the latter, か
in a question form without です is very often used only towards friends or those
with a lower status, like a school freshman to seniors. So the latter could
feel quite oppressive or downright accusatory. Taking かout makes it neutral,
less impolite, and thus more polite

In essence, sometimes, having more syllables or certain 語尾 adds an implied
intimacy or changes the distance. And it can be impolite because the distance
might be too intimate or the attitude might be inappropriate = less polite,
EVEN IF the sentence has a polite form like です。 So if you take the 語尾 out and
back off, it can sound more polite because the distance might be now more
appropriate or there is no more attitude. So I believe this restoration of
politeness by taking the offending negatively modifying ごび out from the
sentence is the rule of how having less syllables could be more polite.

It's a different way of thinking. Adding more syllables is one way to be
polite. Taking syllables away can achieve a similar effect albeit by being
less rude/impolite/intimate thus an illusion of elevating the politeness. If
this was a math, and 1 meant being polite for the "given situation", then
adding more syllables to be polite would be like 0+1=1 while the less
syllables to be less impolite would be like 1-1-(-1)=1, with the first -1
being the 語尾 which modifies the politeness the original sentence、and the 2nd
-1 being the act of taking the 語尾 out of the sentence. Might not be without
logical flaw in the formula, but you get the idea.

If you are interested, more on 語尾 can be found below. Need to be an advanced
reader but a very fun read. Very interesting even to a native. Has many real
life examples on this topic

<http://headjockaa.g1.xrea.com/realjp/index.html>

Additional stuff on this subject from University of Tokyo Foreign Studies

<http://www.coelang.tufs.ac.jp/mt/ja/gmod/contents/explanation/096.html>
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> Btw, is the n supposed to be in red too?

Yes; editing for these kinds of videos has minor slip-ups like that all the
time.

> What's up with that MORE syllables are actually LESS formal / MORE casual?
> What are other examples of this?

There's no reason not to expect that. We see it in English all the time -
e.g., the use of "like" as a filler word.

> お誕生日おめでとう is more polite / more formal / less casual compared to 誕生日おめでとう
> right?

Yes, but that's only because お in お誕生日 is specifically an honorific prefix in
this context.

(So is the お in おめでとう, by the way:  
[愛]{め}でる (dictionary form) ->  
めでたい (continuative + たい to make the desiderative) ->  
めでたく (continuative again) ->  
[めでたう -> めでとう (two-phase sound
shift)](https://japanese.stackexchange.com/questions/42890) ->  
おめでとう (with honorific prefix))
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