The older I get, the less I want to use new browser features that have already been somehow possible with existing ones that typically have been around for literal decades.

Adopting them makes a future with multiple browser engines more labor intensive and unlikely as the number of standards targets one is required to support grows and it becomes a game of asking yourself what sites you want your browser to support.

If you don't have a lot of experience in web software, you might think, that's a silly thing to think about, but I think it's that level of maybe exceptional thoughtfulness that has really profound ramifications. If you do have a lot of experience in web software and you think it's silly to think about, you suck.