Every connector is a point of failure.
So, if you upgrade the 'CPU' how do the other older components keep up?
The idea of being able to swap out defective parts sounds great, we can avoid throwing out a phone and wasting parts, but I have a drawer full of working obsolete phones which get put into the bins for recycling. The failure rate of phones is not high enough to warrant this.
'Every connector is a point of failure.So, if you upgrade the 'CPU' how do the other older components keep up?"Excuse me, you must have accidentally made an account on this PC enthusiast website. You clearly don't belong here