The thing about writing is that it's not a trivial skillset, it's not a trivial effort, and you can't have something of substance (or indeed anything at all) to say about any and every given thing on demand.
No, not even on the scale of "I like this art."
Which is to say, I understand the wish that more people commented on things, but you actually cannot manufacture either the ability nor the things-to-say in people by talking about your wish for it.
Not to be mean, but the non-triviality of the skillset is actually demonstrated by the fact that 90% of people saying that sort of thing can't manage it without coming across like they're saying "if you're not going to use your words, don't interact at all," when I do not think any of them actually want to part with their Likes. Which! Are specifically a technology for people to express their appreciation without demanding any verbal skill to do so, or any necessity to process that raw appreciation into a choate reaction! Like applauding a busker!
The best you could get, really, is to manufacture a site-specific culture that We Don't Click Like Here, We Have A Rote Rubric We Put In The Comment Field For That, and do I need to point out that that doesn't actually achieve your wishful thinking? And that even that amount of friction strips out a bunch of people who would have hit Like?
You can't just go "Well, you've got a comment field, where's my unforced genuine meaningful human connection!?"
