It’s been a fairly recent development that authors have been intentionally creating ace (or aroace) characters at all. What was much more common were lead characters reacting against comphet by claiming “they don’t understand love at all,” feeling abnormal, etc., then discovering that they had feelings about a same-sex partner, i.e., discovering their own lesbianism, with kissing/physical intimacy as the standard yuri-genre narrative endgame.
Yuri has been a romance genre, full stop, and authors are still in the process of exploring how to incorporate non-romantic and/or non-sexual emotional connections into a romance genre and discovering how audiences react to such characters.
So, sure, some readers have reacted negatively to the mere presence of ace characters, but it’s much more common that stories with ace characters have confused readers about what kind of stories they are going to turn out to be.
I think Crescent Moon and Doughnuts is kind of a breakthrough in showing an OTP ending up in a deep and mutually satisfying emotional connection without one or both characters having a “lesbian conversion experience.” (I mean, there have been such stories before, but this one seems like it uses the yuri story template for ace characters as if it’s just a standard genre variant.)