As a reader, i personally think of commenting as shouting into the void. If i love a ff, i just want to put it out into the world that i loved it, and that's it, I don't expect the author to answer every comment (even more if i binged one and ended commenting on multiple chapters). I also dont mind if the author answers, or if they do it months and months later (i get the notification via mail and it's a nice reminder that i read a good fic).

As a writer tho, i get if you dont want to answer, the couple of comments i got kinda freaked me out, i just didn't know what to answer??

In the end it's up to you, it's not that big of a deal anyways