One final thing I'd like to add is that you can have a slim computer with a replaceable battery. You probably typed this comment from one [1]. I don't see why they couldn't adopt this adhesive strip approach for the MBP. Perhaps it would create a teeny less room for the battery, shaving off 30 seconds of battery life on a laptop that already has significantly better life (when new) than most? I don't think this """trade-off""" (if it even exists) is worth it. There are also plenty of non-Apple examples of laptops with replaceable batteries and a MacBook-level slim design. The XPS 13 apparently beats it: 15.35 mm vs 15.6 mm. The Framework Laptop is not far off at 15.85mm.

Of course, having the ability to replace everything else is great, but the battery should be a given. None of the other components are "consumable", though they might still fail eventually, or you might want to upgrade them.

[1] https://www.youtube.com/watch?v=HMVDIMmbeoA, https://www.ifixit.com/Guide/MacBook+Air+13-Inch+Late+2020+B...