What I'm adamant about being able to upgrade is my software. The big problem with the apple ecosystem is that, while they've been pretty good about it, you are still at their mercy to receive regular software and operating system updates. Once apple is done with your hardware, that's it, you own an insecure brick.

It's not the upgradable ram, cpu, or storage which is eat into the power consumption budget. Instead, it's the interface and the standard that can become dated. Apple gets to choose all the voltages and interfaces for each generation which allows for a tightly coupled integration with their firmware and hardware all around. A PC user is stuck with the likes of ACPI and UEFI coordinating everything. And of course, they have to play with the current DDR standard of the time which may not give the power profile they want.

However, the benefit of the PC route is that there is really no EOL for the hardware/firmware support. A 20 year old computer can run an operating system with the 7.2 linux kernel perfectly fine. Your IPad from that era is a brick. You can't do anything with it. But your laptop from that era? You can slap in a brand new SSD and it'll accept it and boot up just fine. (The one caveat is you'll be SOL if you have an nvidia device).