Do you write throwaway code?

Obviously ignore LLM generated codes for this discussion.

I've heard about this technique from a youtuber about how he always starts with some throwaway code when working on a not-so-clear idea, to build a mvp of sorts, perhaps.

And then throw away everything you've written once you start noticing bad design decisions, and rewrite it from scratch, so you have a better idea about API design next time.

I have also been doing this, and think it's kinda effective for me, so wanted to know if y'all follow a similar approach, or you're a "I'm him" type of person who rarely makes any mistakes.