You can’t expect the typical consumer to have the knowledge of tequies who have been in the hobby for a while. Also, they may not be all up for the hobby either. I know a lot of friends who recognize the superiority of PC gaming yet settle down for consoles because they just do not want to deal with all the shit involved in PC gaming, and that’s fair.
It used to be better. 10 years ago finding a normal consumer PC with proprietary parts was rare. Today, that’s the norm for most big manufacturers. Even Alienware PC’s cannot be upgraded as easily, ever since Dell bought them and started using proprietary non-standard hardware.
In the end, is better to buy components and put together the system yourself, or pay someone to do it for you, or have a friend do it for you. Is not rocket science, but some people may simply not be interested in going through that