> Is supporting at most 64 GB really that much better than a laptop with 64 GB soldered in?
Yes. Normally some people (like me) can't afford to buy the highest spec laptop. Thus, I'll be going with a lower memory and storage version of a machine, and then expect to upgrade the RAM and storage when I've got enough. That's exactly what I did with my current Thinkpad T440. And for a current gen Apple, I can either buy a 8 or 16GB machine, and the price difference is pretty significant for me.
Yes. Normally some people (like me) can't afford to buy the highest spec laptop. Thus, I'll be going with a lower memory and storage version of a machine, and then expect to upgrade the RAM and storage when I've got enough. That's exactly what I did with my current Thinkpad T440. And for a current gen Apple, I can either buy a 8 or 16GB machine, and the price difference is pretty significant for me.