Too hard to display their ads if people access their content via API. I am not going to be surprised at all if reddit soon announces features leaving the API or completely getting rid of it.
Sounds like the current old reddit site. They keep adding the new features pretty much only to the redesign and soon it'll just be the bloated redesign. They slowly make the old stuff more and more shit until you either have to suck it up and switch or suffer through bad UX.
Case in point: Reddit has a /u/backtickbot, whose whole job is finding comments containing code blocks that don't render properly in old.reddit.com and alternate Reddit clients, and responding with a (link to) fixed code block.
I feel like this would be a very easy change for Reddit Enhancement Suite (RES) to implement and have support for by default.
But this gets into my similar point where you end up having to use tools like an extension or bot to fix functionality reddit leaves out.
It's gotten pretty annoying for some things already. Old reddit doesn't support polls but in a weird way you can still see it from old reddit like an embedded piece of media.
Overall it's already feeling pretty hacky and I'm sure it's just going to keep getting worse. I've tried to switch to new reddit multiple times and it's just so much slower. I'll admit it "looks" better, but I still get the same functionality but in a more efficient manner on the old reddit. The new reddit just feels slow and bloated.