I waltzed into a tech screen thinking I could handcode python after having LLM be primary at it for over a year. Yeah, there's atrophy -- I humiliated myself and took the lesson. :)

There is a meta-argument about whether companies should interview about hand-coding anymore, but... the skills do atrophy. I've been mixing hand-coding into my routines ever since to try to keep those skills lukewarm. I'm not yet sure if I am wasting my time doing so or not.

$0.02