I don't understand all the busywork goes behind new browser updates, just to retain their market share (since they can afford more engineers, than say Ladybird). Is this needed? It's not rocket science, folks.
Psh, rocket science only has to contend with physics, which generally doesn't change much, if at all. The equations used to get humans to the moon didn't change because someone discovered you can send a specially crafted packet and escape the sandbox and steal money from everybody on the Internet.
All these CSS upgrades have been meant to reduce the need for Javascript for all the things web devs do out there in the real world. It's a good thing.
You should tune out more of the ambient cynicism because it's ignorant and unhinged. People who don't follow any standards discussions, don't talk to web devs, don't read anything except headlines and who are only imitating the attitudes of whatever cynical, depressed social media bubble they fell into.