Most computer sales these days are upgrades. The majority have a computing past and migrate to their new systems. Both my private Mac and my private PC have more than a TB stored on them. (And I have a NAS!)
Even my daughters produce more data with videos they shoot using iOS devices - they are currently saved by iCloud (but the kids hate it when they need to download the videos, because it’s so slow compared to on device storage). 256GB isn’t enough even for those without much history, like my pre-teen daughters.
God forbid they want to play a game, Baldurs Gate 3 for example that Apple uses in a lot of promotional material, requires 150GB.
If you don’t have any data history, don’t use mobile devices to shoot anything, don’t play games, don’t … 256GB might be enough. Although you might kill it fast because if you run an 8GB system, as you might have to page excessively to the small area you have free even by simply browsing the web.
In practise, and from this thread, it seems those that use small on-device storage do so because they solve the problem elsewhere - on other computers, cloud or web storage, external drives, NASes. Not because 256GB is enough. But external storage carries it’s own set of problems. It would have been so much better if we could simply plug in an m.2 drive in our Macs. Or, failing that, if Apple didn’t charge extortionate prices for upgraded NAND capacity (and RAM), forcing users to external storage solutions.
Apples policies on storage reminds me of Robin Williams’ genie in Aladdin - "Limitless Cosmic Power!…in an itty bitty living space".