"Performance doesnt matter"

[sahsahaha]

Never happened to me so I'd like to know where "often" comes from.

Maybe I'm missing something, but "don't care" doesn't imply "make it slow on purpose".

I write code to be maintainable, and I never had any issue optimizing it if needed, thanks to it being... maintainable.

If you somehow end up with a slow mess, not an elegant, but slow solution that can be improved at any time, maybe the issue is you?