As an example of this in the wild a few years ago I attended an online course teaching HTML, CSS and a sprinkle of JS where most attendees had their first encounter with a source code editor there. One person used to retype over and over work they've already done in a previous session, sort of like karate katas in a way. At the time it felt a bit silly to me but in hindsight it totally made sense.

For something in a similar vein but more short form there's HackerType:

https://www.hackertype.dev/

I'm really happy to see that there is something actually valid to this repetitive practice!