But sometimes you already have something that works, is correct and fast, but you still want to simplify: for example, when understanding _why_ that code is correct is too annoyingly complicated to explain and understand.
It’s factually correct due to hardware and compilers (néé transpilers) offering so much headroom, but part of me cries when you compare modern hardware utilization compared to how optimized-to-the-gills late generation PS2 games were.
I write a lot of data-pipeline code in Python that mostly runs once a day. Does it matter if it takes an hour to run instead of five minutes? Not really, as long as it's ready to go for the next run.