Personally I think the new keyboards are really good, there's a lot less travel on each key which makes typing more efficient. Going back to an old keyboard with full travel feels like hammering on a typewriter.
Apple could build a mechanical keyboard with their characteristic design and build quality.
I think the new butterfly switch is useable, but I don't share your enthusiasm. I have not been able to fully adjust to them and I still make typing errors from my fingers sliding off more than I'd like.
Matias isn't the only vendor and that's not the only model of mechanical keyboard they make. If you're a mechanical keyboard enthusiast you're living in the golden age of options. You can custom-build your own keyboard, pick individual keycaps, switches, and more.
There's vendors like http://www.wasdkeyboards.com that are basically "Build-a-Bear" for keyboards.
But it feels great and wears like iron. Source: I've used one for the past 7 years.