This is the first thing I've seen so far that's genuinely surprising to me given all the machine learning breakthroughs of recent years.

Lots of other things mentioned piss me off too, but I can usually see (to my dismay) where the perverse incentives lie, or the lack of a market drive, or whatever.

This seems like a problem people would like to see solved, where nobody has reason to get in the way of solving it, and that should be solvable by now.

SwiftKey offers dual language keyboards. It’ll suggest and autocorrect based on which language it thinks you’re using.

It’s not perfect, but it’s pretty good.

What phone?

Google's keyboard is great for exactly this (I type in 4 different languages regularly).