This applies to typing Dvorak and Qwerty as well, you don’t really forget. It’s like dancing, you can learn salsa and foxtrot without losing the other.
Addendum, for split keyboards there was no learning curve at all. Really you just put a hand on each split and that’s all there is to it.
> for split keyboards there was no learning curve at all
I'm guessing this is only true if your finger alignment matches with what you need for the split keyboard? I think a lot of people are used to using their right hand for some of the keys on the left side of the split and/or vice versa.
That’s a fair point, I was already a Dvorak typer when I got a split kbd which I think improved my typing technique. I’ve heard before that Qwerty encourages bad techniques.
Addendum, for split keyboards there was no learning curve at all. Really you just put a hand on each split and that’s all there is to it.