hey! i was just wondering why it is not okay to say "some aros can love" with characters like this. im arospec and in a relationship, i do have boundaries and certain acts of affections make me uncomfortable but i still do love my partner and i consider myself to be an aro who likes being in a relationship. maybe it's fairer if the people who write the character in question in a relationship with other characters if her aro-ness is visible and an important point?
It's not that it's not okay to say that "some aros can love" - it's that in this context people are using that as an excuse to erase her aromanticism. If you as an aro person want to write a character like that, go for it!* But if someone is just looking for an excuse to ship a character and ignore their aro identity, that's not cool. So yes, if they make her aro-ness visible and important, I would say that's okay, but are they really trying to represent aro people with this argument? No.
Also, it's very telling that every time a character is aro, this argument comes up. Sure, some aros can love - but why are you (general you) so obsessed with that possibility? Why can't you be happy for an aro character who doesn't want a relationship? Representation for non-partnering aros is important too!
*I do think alloro people can also write aro characters with care and depth. But let's be real, not very many alloros are going to want to do that, not when they could focus on romantic shipping. Which is the issue in this case.
Also, "some aros can love" can be alienating to loveless aros. In the same way that it sucks, as an aro person, to hear someone say "sure I'm ace but it's okay I can still fall in love," it sucks for a loveless aro to hear "sure I'm aro but it's okay I can still feel love." We don't need to prove anything. It is true that many aro people feel love! That's great! But let's not imply that aros who don't are somehow lesser or lacking. (I don't think you're doing this on purpose - but it's something to be aware of!)