Depending on model, I guess. My 2 year old x360 has so bad airflow for cooling that I've had multiple "meltdowns" if I forget to put a spacer underneath it. Basically the whole thing shuts down and won't boot again for an hour, and the underside is painfully hot. A pencil underneath the screen hinge works best for keeping enough airflow to avoid this.

The first time it had a meltdown, my touchpad stopped working completely, so I went with an external mouse. Second time, the touchpad melted itself back into place I guess, so now it works again.

The newest Macbooks (2021) are looking pretty good tbh. They reworked the design to make the battery trivially replaceable and by the looks of it, they will be selling the battery to end users soon.

But battery is about the only thing you can replace. If your trackpad or keyboard fails, you have to swap out the whole top assembly. If your camera or display cable goes, you have to replace the lid.

Part of that is unavoidable as laptops become ever more thin, but I am reasonably sure Apple could make the keyboard replaceable.

I recall on the older machines that they had upwards of 60 screws holding the keyboard into the top panel. I’ve not checked out a teardown in a long time, is that still the case or is it riveted in?

I always suspected that 60+ screw solution was very much over engineered but I guess they wanted to eliminate any potential for flex of any sort.