Choose the implementation that you like, or contribute to help make one better. Just like all other software on your computer.

Don't like Libreoffice's implementation of Word support? Install Koffice. I take it you've never installed non-OEM software on your computer?

Why would anyone install Koffice when clearly they would wait for the OS to support Word directly?

Not at all. If you want or need a feature it's not some "my browser has to support it or my OS does" dichotomy.

As a couple parents up stated, there's no technical reason a browser has to have a transformer embedded into it. There might be a business reason like "we made a dumb choice and don't have the manpower to fix it", but I doubt this is something they will accept, at least with a mission statement like they have.

I much prefer every individual piece of software and website I interact with implement their own proprietary AI features that compete for my attention and interfer with each other.