OK so #Reddit search has always sucked.
It has sucked especially in the New Reddit era.
Now, they have deployed the Even Newer Reddit user interface.

One of my biggest use cases of Reddit was "what are people in various communities talking about this particular video"?

In Old.Reddit, you could at least see crossposts in the unlikely case that the YouTube URL was somehow equivalent to the actual URL posted to Reddit. You know, because YouTube videos could be called upon by many requests, and Reddit fucking gave no shit about any URL normalisation.

But they at least let you see if anyone had crossposted shit.

Apparently, the New New User Interface fucking doesn't even let you do that. I tried searching for a particular video that was already posted in particular communities. Nothing.
Tried Google Search to find this particular thing. OK, found it.
Slapped "old." to it. "6 discussions."
That's it. Reddit was already shit at finding discussions about particular YouTube videos if you didn't use old.reddit. The new Reddit interface at least pretended the crossposts were there. Crossposts no longer are there. Why the fuck do people even follow the site any more.

#RedditMigration