You could also argue that things are like this right now. This is why tutorial makers typically don’t use pie menus. They don’t want to confuse new users who don’t know how to enable them. Having more customization shouldn’t present a big issue for tutorial makers because they will be able to teach the default setup.
However, everyone seems to think having that amount of customization is as easy as “just do it”. Judging from statements from developers in the past, this is a more technical issue. I don’t understand the complications, but it seems that they have to be careful with how they implement customization.