I was puzzled by this use of "１日," which I had not encountered yet (from
tangorin.com):

> 私たちはたいてい１日の主な食事を晩にとります。  
>  We usually have our main meal of the day in the evening.  
>  わたしたちはたいていいちにちのおもなしょくじをばんにとります。

Questions:

  1. Is this reading by tangorin.com correct?
  2. Why do example sentences in WWJDIC, Tangorin, or Jisho.org not come with readings by default? What is the point of having example sentences with computer-generated readings that one cannot trust? Your insights would be appreciated. Perhaps it would reduce my frustration somewhat.
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multiple-readings
１日 reading, yet again
Okay. So we have: ついたち, いちじつ, and いちにち. [ひとひ and ひとえ are both indicated as
being obsolete]

ついたち is pretty well shown to be used for the 'first day of the month', so this
usage is unambiguous.

This leaves us with いちじつ and いちにち. Which one is correct? いちにち is the more
common form. The vast amount of the time this will be the reading. いちじつ is
often used in compound kanji sets (四文字熟語, etc.）and would necessitate the kanji
element 「一」 rather than the Arabic numeral '1'. The usage of いちじつ is more
literary/poetic.

While you said that dictionary.goo.ne.jp didn't provide readings, the link
that you posted in the comments was actually informative as to their usages.

To answer your second question, as to why these sites do not choose a
'default' reading, I would say it is because all readings are equally valid
and their selection depends on context. Also, a 'default' reading indication
can possibly encourage people to select an inappropriate reading and
discourage them from selecting the most appropriate reading. Possibly having a
'usage frequency indicator' might be helpful though. You might want to ask
them why they don't have something like this.
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answer