"runs out of room for updates"?!?
I think you are reading about terrible designs that have happened on the Windows side --
where the OS is both MUCH larger than iOS (starts off being larger, then add in 32bit and .NET support) AND
requires pretty much an entire copy of the OS as a backup in case you overwrite the original AND
vendors were selling 16GB devices
12 days ago I purchased a Mediacom tablet winpad700 with Intel processor and windows 10, 16gb memory, 1gb ram, 1024x600 7inch screen and I'm unable to make update. I have a microSd card 32gb and a
answers.microsoft.com
I have never encountered a realistic case of this on iOS. The closest we get is the (admittedly very irritating) case where you have say a 64GB backup that you want to install on a 32GB device and iOS gives you no way to prune the backup, to say "yeah, just install what you can but drop the photos and movies if you have to".