This is absolutely true in my case as well - on the desktop/laptop. I use Fedora fwiw also so Windows/macOS slowing down over time isn't applicable in my case.
That said, it is definitely not true in the case of server hardware.
I have a home lab with a few R620s that have 2014 era Xeons in them, and while there are a lot of parallel cores, single core performance is abysmal compared to newer in-class hardware. For CPU-bound single-threaded tasks, I actually spin up a Linode and use that, rather than my on-prem hardware.
I would also note, I have only Intel. I'm going to build an AMD rig here within the next few months though because I've had numerous people tell me that it's noticeably better.
That said, it is definitely not true in the case of server hardware.
I have a home lab with a few R620s that have 2014 era Xeons in them, and while there are a lot of parallel cores, single core performance is abysmal compared to newer in-class hardware. For CPU-bound single-threaded tasks, I actually spin up a Linode and use that, rather than my on-prem hardware.
I would also note, I have only Intel. I'm going to build an AMD rig here within the next few months though because I've had numerous people tell me that it's noticeably better.