This all might be true, but as a reason to not install patches, it still makes no sense. If you don’t trust the baseband or the OS, why did you buy the phone to begin with? You trust iOS n, but not iOS n+1?
One is forced to buy a phone, as an expectation/requirement of modern society. This does not imply they wish to spend even more money in support of the broken ecosystem every year/six months/etc.