Especially when we as modern users run multiple applications, each of them deciding optimization is not worth bothering with.

That's not what I said, at all. Optimisation where it matters is important.

I’m not sure if you meant to reply to me. I was commenting on what dusted said

No, it's not. Not at all. I care about performance in my architecture, design, and code. However I _don't_ care about eeking out every %ge in every scenario.

The difference is caring where it matters. Bugs and mistakes happen. The measure of someone who cares and someone who is improving is how they handle it when these issues happen.