I have posted only one WIP in my entire fanfic career. (Getting it through beta took far, far, far longer than I had planned.) There were a total of five chapters, and someone commented at length on the first four chapters ... but not the fifth. And yeah, I worried that they hated the resolution! (They later came back and left a lovely comment on the last chapter -- they'd just forgotten.) So, unfortunately, yeah, I get why you'd worry about that. :(

I used to comment on stories, but I somehow lost the ability to come up with anything more coherent to say than "I liked this", and I figure a kudo connotes that just as coherently with no pressure for comment replies. It's a shame, though, because some lovely relationships came out of commenting on fics, back in the day ....