I bought an M1 Max with a 2TB SSD, but I’m running up against the capacity and I want more storage. The computer is still plenty fast. Normally, I’d upgrade my computer and continue using it, but now I need to sell it and get a new one to get more storage. Not to mention the carbon cost of doing that, these things are $4000!

Further, when I buy a new one, I’m now incentivized to over-provision it based on my current needs by that same logic.

OWC has an entire business around this (for older Macs): https://www.owc.com/

Photos and videos get larger each year with larger sensors, so it can be hard to predict future usage if you take a lot of those.