I had an interesting experience the other day. I have been using split keyboards for years, but only recently began using a Kinesis Advantage 360 Pro as my daily driver for work; I am so use to the layout now, that in instances where I have to use a non-split, or even my older splits, my fingers fail me entirely - like my brain forgot how to type, my thumbs eagerly searching for the thumb cluster that isn’t there.
It’s not TOO bad. I am now forced to go back to the office once a week to sit in calls at the office instead of at home, which means that day I have to sit on my laptop in meeting rooms talking to TVs (yes, I hate that) and use the MacBook keyboard. It’s not the worst or hardest thing ever, but my wife has made fun of me for not remembering where the print screen key is on a full size. So there’s that.
I have started adding splits to each of the computers at home though. But honestly it’s kinda harder to use different split layouts more than moving between split and what we should call “bad” keyboards :)