Don't they?
I just went to crates.io and picked a random newly updated crate, which happened to be pixelfix, which fixes transparent pixels in pngs.
It has six dependencies and hundreds of transient dependencies, may of which appear to be small and highly specific a la left-pad.
https://crates.io/crates/pixelfix/0.1.1/dependencies
Maybe this package isn't representative, but it feels pretty identical to the JS ecosystem.
Any new regulation the EPA introduces results in litigation. Some of the previously introduced PFAS regulations weren't done in accordance with how the Safe Drinking Water Act says they should be (regulations were introduced without the necessary public consultation), so they're applying to partially vacate the previous ruling. Notably, they're _not_ applying to vacate the regulation of PFAS chemicals where they say the process was followed correctly.
So, the legal reasoning might be to cut their losses litigating to defend rulings they think they'll lose due to the administrative error. I also suspect that being seen to roll back some regulations likely gives Lee Zeldin (the EPA admin) some political room to maneuver. He's historically be associated with anti-PFAS efforts (in Congress he represented a district with contamination problems and he voted for anti-PFAS legislation), but he's also part of an administration with a strong anti-regulation agenda, so he needs to walk a fine line.
While it's a different niche, the worry for YouTube is that younger viewers generally consume a lot of short form video. They might eventually shift to watching more long form content as they get older, but if they're accustomed to one provider it's going to be easier for that provider to expand into long form content than for YouTube to persuade them to switch or use a second provider. So YouTube feels it has to move into short form in order to ensure long term maintenance and growth of its user base.