That’s essentially the same issue just one level down. No reasonable ‘tech noob’ would willingly choose an OS for which they know that they will find reduced support for. ‘Fix X on IOS’ is quite a lot more likely to find results that. ‘Fix X on murena /e/os’
Wild example for a custom os

Not saying youre wrong, but you are oversimplifying human priorities in life. I think it is similar to, when we tech nerds say, ‘just switch to linux’ People want stuff to just work. Mentally a few hundred Euros is easily worth the perceived simplicity of a product.
Advertisement and just general brainwashing does heavy lifting here as well. Apple still has a reputation for simplicity even though recently, I have only heard lifelong users have a LOT of trouble with it. Especially since the liquid Glas thing.
If I am in the middle of life, maybe kids, not a lot of time, job pressure. Chances are I want my free time to be outside the computer. Most people would rather chew Glas than sit down and read the arch wiki so setup (wild example) encrypted partitions. The bias on Lemmy is immense but it would be ignorant to say that normal people should ‘stop being lazy and just switch’