Just noticed this today, not sure if it's expected:
The reason I'd be in favor of including comments in the search is then you have a higher chance of finding what you're looking for, based on synonyms people might use, etc.
https://meta.stackexchange.com/search?q=%22I+would+suggest+adding+the+word%22
I would have expected to find this link:
Hot Meta Posts: Allow for removal by moderators, and thoughts about future improvements