It’s more that the number of sites I’d add to my home screen has a hard upper bound that’s not high, management is easy, and if I want one without it being on the home screen I can send it to the app library instead, where it’ll surface with a search.
Bookmarks on the other hand are unbounded and suck to manage (no browser has improved meaningfully in this realm in ~20 years for some reason) so the threshold for what gets bookmarked is higher.
It just feels a bit of an edgecase to imagine that a menu of a specific restaurant is important enough to occupy a spot in the top 20-25 of your digital real estate.
Bookmarks on the other hand are unbounded and suck to manage (no browser has improved meaningfully in this realm in ~20 years for some reason) so the threshold for what gets bookmarked is higher.