Desktop and laptop sales are declining, but that's probably because they're all fast enough now and there's no reason to replace them unless they break.

This, and a lot of people got new desktops/laptops during the pandemic.

I actually got my laptop in late 2019, and it is still running smoothly. Back in thr day a 5 year old laptop would be ancient. Now it still runs fine everything I want on it.

I also think current hardware is lasting for a longer time than before. I remember I used to have a lot more issues with faulty components after a few years of use, etc.