256GB was chosen for a reason, I don't think it's random, it's because Nintendo knows most 3rd party games are 150GB max ... 256GB ensures all their development partners that you can make your game on Switch 2 and every system technically has the internal storage to hold the entire game. 128GB would have been a problem, 256GB isn't.
Now a consumer may have to flush their fridge, but that's not really the publisher's problem, you can still use even bog standard dirt cheap regular SD Cards for cold storage and move games in/out of the main storage or buy one of Samsung's upcoming faster SD Cards and two pools of storage.