I agree with both of you. Once I optimized a major Python project to avoid some bad disk access patterns. Nobody noticed them because everyone was using SSDs an

I agree with both of you. Once I optimized a major Python project to avoid some bad disk access patterns. Nobody noticed them because everyone was using SSDs and those patterns didn't hurt (too much) performance on those, but I was running on an HDD and I had run times of hours (vs a couple of minutes for everyone else). But my optimizations were guided by the profiler and a (more or less) correct analysis of the results.