Comment by windowsrookie

"How many M1 mac will still be functional in 20 years?"

Probably quite a few, MacBooks have had soldered SSD's for over 10 years now. My 2018 McBook Pro still has a perfectly functioning SSD. I still see people using 2015 and older MacBooks all the time. There is no widespread SSD failure issue after 10+ years of Apple soldering the SSD's.

For most people the SSD's are lasting longer than the useful life of the device.