I upgraded my personal laptop a year or so after I got it (started with 8GB, which was fine until I did Docker stuff), and I'm probably going to upgrade my desktop soon (16GB, which has been fine for a few years, but I'm finally running out). My main complaint about my work laptop is RAM (16GB I think; I'd love another 8-16GB), but I cannot upgrade it because it's soldered, so I have to wait for our normal cycle (4 years; will happen next year). I upgraded my NAS RAM when I upgraded a different PC as well.

I don't do it very often, but I usually buy what I need when I build/buy the machine and upgrade 3-4 years later. I also often upgrade the CPU before doing a motherboard upgrade, as well as the GPU.

Meanwhile they just keep selling like crazy and people love them. I think the issue comes from having pricing expectations set over the in race-to-the-bottom world of commoditized Windows/Android trash.

I might agree if Apple hardware was actually better than alternatives, but that's just not the case. Look at Louis Rossmann's videos, where he routinely goes over common failure cases that are largely due to design defects (e.g. display cable being cut, CPU getting fried due to a common board short, butterfly keyboard issues, etc). As in, defects other laptops in a similar price bracket don't have.

I've had my E-series ThinkPad for 6 years, with no issues whatsoever. The USB-C charge port is getting a little loose, but that's understandable since it's been mostly a kids Minecraft device for a couple years now, and kids are hard on computers. I had my T-Mobile series before that for 5-ish years until it finally died due to water damage (a lot of water).

Apple products (at least laptops) are designed for aesthetics first, not longevity. They do generally have pretty good performance though, especially with the new Apple Silicon chips, but they source a lot of their other parts from the same companies that provide parts for the rest of the PC market.

If you stick to the more premium devices, you probably won't have issues. Buy business class laptops and phones with long software support cycles. For desktops, I recommend buying higher end components (Gold or Platinum power supply, mid-range or better motherboard, etc), or buying from a local DIY shop with a good warranty if buying pre built.

Like anything else, don't buy the cheapest crap you can, buy something in the middle of the price range for the features you're looking for.