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> まあ桃は普段から笑顔な **分** 、つかみ所のないやつだがら多少気持ちはわかるけど。(talking about how people can
> find momo hard to deal with)
>
> 基本が少ない **分** 、技術が必要なんだよね。ま、そういうわけでクロールとかに比べれば平泳ぎは持久性あるよ (talking about the
> breatstroke relative to the other swimming styles)
>
> 普段気軽に足を運ぶ **分** 、その恐怖がリアルに俺の体を襲ってくる。 (talking about conbini after getting
> berated about how it sucks to work there)

I can see how the ["one's intended or hypothetical partial involvement with
something"](https://japanese.stackexchange.com/questions/13653/the-meaning-
of-%E3%81%B6%E3%82%93-in-%E8%A6%8B%E3%81%A6%E3%81%84%E3%82%8B%E3%81%B6%E3%82%93%E3%81%AB%E3%81%AF)
explanation can apply to the 3rd sentence, "I normally walk into the conbini
without a care in the world <- emphasis" but i find it hard to apply the same
meaning to the first two.

A somewhat literal interpretation of 分 as "part/part of" for the first two
sentences isn't immediately intuitive either.

A a glance the sentences seem normal with a generic normalization instead of 分
so what is the difference?
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question
grammar subordinate-clauses
clause ending 分
I would say the sense of this 分 usage is to indicate a kind of "proportional
increase" - the 分 indicates that whatever comes after it is increasing in
proportion to what comes before it.

In the first sentence, Momo may or may not be a particularly つかみ所のないやつ aside
from this, but the fact that s/he is always smiling _adds_ a certain amount of
つかみ所のなさ. The 分 represents this "amount" that is added.

Similarly in the second sentence, the need for 技術 increases in proportion to
the lack of 基本. (If you consider the amount of effort put into something as a
constant, then not having to devote as much effort to mastering the basics
means you have to devote that same effort to mastering advanced techniques
instead, so the "proportion" element is fairly literal in this case.)

The third sentence is the same sort of idea - the apprehension he feels about
going to the conbini now feels _more immediate_ (more リアル) in proportion to
how casually he usually goes there.

You might be able to find more information on this usage by looking up その分,
which is a very common form it appears in.

I'd say this usage is related to the "hypothetical partial involvement" usage
you referred to, because they're both narrowing things down to examine the
effect of a single factor. When you say 見ている分にはいい, you're saying "I don't know
about other aspects of it, but to _look at_ it's fine" - talking about just
the appearance to the exclusion of other factors. And when you say
毎日見ている分、なじみがある you're saying "I'm used to it, particularly because of the part
where I see it every day."

The main difference between the two, I suppose, is that ～分には tends to imply
that this focus aspect _contrasts_ with other aspects of the same thing (eg.
if you say "it _looks_ fine..." you're implying that other aspects of it
probably aren't fine) whereas the ～分 usage tends to imply that this aspect
_complements_ other aspects (ie. you're looking at one factor _contributing
to_ a larger effect.) Though ～分 may imply a contrast with _other_ things that
don't have this factor (eg. the 基本が少ない分、技術が必要 sentence implies that
breaststroke is _more_ technique-focused than other swimming styles that have
more basics to learn).
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answer