I'm pretty excited about these. They seem to have delivered performance for the price. And by price, I mean not even a sticker shock. We still know these will be the lowest-end versions of the Apple Silicon era, they offer something compelling for someone who needs a device now. Better than their previous version. Better than competitors.
But! I can still see plenty of space in there for an M2 drive slot. I see plenty of room, and much less of an excuse, in the Mac mini. For all that is good, it's a kick in the gut how much it costs to move up to a 1 or 2 TB drive. No good reason they couldn't put it in there other than they don't want their customers to have it.