I feel like these are the only things worth upgrading even in a desktop too. Unless you are the kind of person who buys the new CPU every year, upgrading anything in a desktop usually means replacing almost everything.

Every time I've looked at upgrading a part in my PC it's been the case where the CPU socket has changed, memory has changed to the next number of DDR, etc so it's basically just buying a new one of everything but the storage, psu, and case.

There are absolutely cases where I've wished I could upgrade the storage in devices though.