>Yes, there are definitely people who argue that performance never matters.

Never seen one, post an example.

>half–second loading time on a webpage loses them a lot of money.

I didn't say milliseconds don't matter, I said it was diminishing returns. The size of those returns depend on the business. For Facebook it matters because users have other options to use their attention on such as Youtube and other social media. A B2B SaaS such as some CI/CD tool can care less about it because their users have lock in, they can't just switch tab to a different CI/CD tool and start using it immediately. So the threshold of acceptable performance depends entirely on the use case, which the author keeps ignoring to fight strawman absolutist arguments instead.