I'd add "expandable storage" (and "can be fixed") because even if it's an Apple-esque SoC (which we're clearly going to be seeing more of in the future by other brands), there is no reason to not offer one or ideally two m.2 slots that you can just stick more, "slower", storage in.
I'd venture to guess that the take rate on custom configs from any manufacturer is quite low. Most consumers are going to go to Best Buy, Apple Store, et al and buy what config is available today, not wait to order some custom model.
Then it's a good thing no one charges that. I'm all for calling out Apple for bullshit, but their "768 GB more" model is a $200 upsell, not $500. And yes: it's a huge leap from $200 to $500.
Depends on the model. The MBAs and Mac Mini ship with 256GB by default and getting 1TB (768GB more) is an extra $400 USD. The MBPs and Studio/Pro start at 512GB so 1TB is "only" $200.
