Feedback feels important to me.
Internally, for me it's nice to make a distinction between when I a writing for others and when I am writing for myself.
If I am writing for myself, which I often do, it's much like my musical busking practice: I am not doing it for the money or attention, but just because it adds a nice public layer where I feel like I should respect at least some social norms. That addition of a lightweight ruleset feels helpful to me: instead of just eliding over the parts of my thoughts that might not make sense to other people, I am forced to at least notate them in some way.
If I am writing for other people, then it's nice to know how something was received; I really am often curious about what others think.
Getting feedback in this fashion has led me to shut up when I have an unpopular opinion, but even that's a really good thing to know.
It has been helpful to see the couple of points where I wasn't sure how my opinions would be taken, and to then either be taken to task for writing unclearly, find a real problem in my own thinking, or to at least have a chance to gather the wrong-headed arguments people may fall into when confronted with some of my thoughts.
And if I am indeed writing for other people and no one is upvoting, than that's good to know as well-- there is literally no point for me to write something for other people which is completely ignored. That's a good indicator about when I am just writing for myself-- which is almost everything I write and then publish as a comment on HN.
So, to answer the OP, I just check my comments and if there is a response in the top couple I may respond back. But if folks are writing replies to my very old comments I, I am not checking those because I'm guessing they are just writing for themselves.