I'm pretty conflicted on this.
On one side, I agree with it because there's no major difference between feedback on the site and a ping on Discord/IRC with the feedback. And I do actually think constructive criticism is a good thing. It will also make the community side more important over gamification, which I think would also be a good thing. It would also pretty much make vote trolls immediately visible/disinsentivise troll voting. (also it doesn't need to be rational, just nice words of support is cool)
In the middle, I don't really think the added effort is worth mentioning. Like, if you don't have time for community stuff, then you don't have time for community stuff. It's just kind of a moot point. No one has to do, listen or see everything at any given time to be part of the community.
On the other side, I disagree because I feel like it won't really stop lazy or aura voting, unless there are rules as for the content of the comment (AKA against only ever saying single/few words like "good" or "meh"), and that's a hell of a rabbit hole. Though I guess it could just be the same kind of ruling as for tagging, which is already familiar.
Plus point 3 and 4 of Jangler's comment.
Personally, I think incentivization for insightful or detailed comments would be a net positive, but I don't know about requiring comments.
If I can give a suggestion, I'd say there could be the choice of making a public vote with comment, and having a "recognition" system for them. The authors of tracks can click on a "Recognize" button on good vote-comments to basically give 1 extra criticist point to the commenter.
Maybe with a limit of recognitions per post, based on the amount of comments? Or maybe a limited account-side ressource to account for certain posts getting overwhelming amounts of insightful, detailed comments?
Of course it would need to show it that the comment got recognized (so we can tell when people are not being fair/taking advantage of the system)
I also like the whole idea of keeping vote-comments for when vote resluts are revealed. Though I don't see why we should keep it anonymous. (but even then, the choice could be there)