Yooo… I disagree. Fully. On literally every thing you said.

If those butterfly keys from the 2015 macbooks had been more reliable and more sturdy, they’d be the best keys ever made for typing.

Absolutely not. I got into mechs because I enjoy the sound and feel. It’s what helps make a mundane, boring task somewhat enjoyable. These little butterfly keys can not provide me with that feeling whatsoever. So have a buttload of other people. That’s why people tune their boards’ sound and do typing tests.

No one has ever put cherry MX brown mechanical keyboard switches on a mouse

They have.

But aside from personal habits, the most objectively ergonomic option (and for most new users, the most pleasant option) seems like it should be a key that balances the most tactile feedback possible, with as little excess pressure and travel as possible, in the most sturdy package possible.

Also good sound. Good feel. An experience you can tune to your personal taste.I type exclusively on linears. The tactile feedback of a Mac (or Macbook) keyboard doesn’t match my preference. Of course I can only speak for myself, but there are other linear enthusiasts out there.

Also, butterfly switches aren’t sturdy. MX style switches are.

So I don’t get why no keyboard makers seem to be striving for this goal?

Because they’re trying to make good, reliable keyboards that are enjoyable to use.

I think I’ve actually seen a youtube video of someone making a mouse switch board and it’s the most cursed thing ever.