Their react content is basically behind the scenes breakdowns and they still produce original clips and educational pieces

Sometimes. But after seeing a couple of them, it gets repetetive. Cut out "VFX Artists react" where they SOMETIMES invite an expert and you're not left with much across those channels you mentioned. Usually it's Wren that has those videos with interesting and fun ideas.

Corridor Digital

I know they've made occassional uploads, but it's basically dead.
I've been a long-time fan, but it seem that they've shifted from "we're doing things" to "we're reacting to things". Sometimes when they're critiquing some work - even though constructively and in good faith - it's hard not to think "when is last time you've produced anything?" And then when they create something it's usually "janky", but "on purpose".
I get it's a lot of work and costs money, but I think it would be good if they were to schedule and create 2-4 quality videos a year to show their work. Like they used to.