It seems like it would be easy for Facebook to support takedowns since it could remove the video from feeds.
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No, stealing (yes, stealing) people's work sucks. Unjustified takedown requests do suck (and what makes them suck so much is platforms' craven response to frivolous requests). But we're talking about real, willful infringement here.
"Content creators don't want that"
You probably shouldn't try to speak for all of us, because you are wrong.
Secondly, just playing along, what he gets is his audience going to the legitimate source for the content, where he will get his full measure of remuneration, where the work will be seen in its proper context, and where he can ensure that it's not tampered with.
An overwhelming number of creators prefer to set their match policies for ContentID to monetize. Some have tiered track/monetize/block policies that are contextually dependent on match length, % match, and country of viewership. But the great majority of creators prefer to monetize. Your mileage may (and does) vary.
Why would they want to until they're somehow forced to? Much like all the fake accounts and associated "like" markets, there's zero incentive for them to correct the issues.