I can type Qwerty, Dvorak, and Colemak all over 100wpm (https://youtube.com/watch?v=mQ6iSYMMHv0 https://youtube.com/watch?v=mQ6iSYMMHv0). You definitely have to

I can type Qwerty, Dvorak, and Colemak all over 100wpm (https://youtube.com/watch?v=mQ6iSYMMHv0 https://youtube.com/watch?v=mQ6iSYMMHv0). You definitely have to practice all three together if you don’t want to lose them. Also happened with language learning. I speak English and Spanish natively. Learned Italian (very similar to Spanish) in high school. After college learned Chinese in China. One day I ran into an Italian person in China and tried to talk to them in Italian. I kept jumbling Italian and Chinese, even though on paper Italian is so much easier for me than Chinese. It was like my brain only had space for all native languages, and just one foreign language. I’m sure with practice I could speak both Italian and Chinese, but that’s the whole point of this comment. It takes practice to maintain them all.