To be fair, most people never change these.

In any case, you can have a separate storage (you need less than 1KB) for these two things.

Half of my technical friends haven't changed theirs from the factory defaults. None of my non-technical friends have changed them. A non-representative sample of SSIDs I receive in my apartment gives 9 default ones, and 2 custom ones (plus mine).

plenty of routers in my country (id go on a limb and say the majority) have both written on a sticker, different password for each device generated when the firmware first gets installed, and people NEVER change it.

edit they also come with a QR code you can scan on your phone to connect to the wifi without manually copy the password, so people just put up that qr code somewhere and connecting is easy enough.