I haven’t thought about it in a while but the premise of the article rings true. Desktops are overall disposable. Gpu generations are only really significant with new cpu generations. CPUs are the same with real performance needed a new chipset and motherboard. At that point you are replacing the whole system.
Is there a platform that challenges that trend?
I’d say that now is one of the strongest arguments for upgradability. Memory is really expensive right now. At some point in something like 1-3 years, it will probably be considerably cheaper. If anything, CPUs and motherboards are expected to be cheaper during this period due to reduced demand for new PCs. If you can tolerate less memory now and want to save money, upgrading then would be a good idea.