People can use locked down hardware and be at the mercy of the manufacturers and support services.
There's a lot more money in that than everyone fixing their own shit.
Same way people who know nothing about how democracy and their country works can still vote. For some reason, they often want more authoritarianism, go figure.
And those replies of "why not know everything hehe" always lead to dismissing the whole argument.
We should all have a decent grasp of molecule rotation and the electric dipole moment before zapping that meal in the microwave!