The issue is that a lot of people want to break stuff with various choices. And the removal of that ability is where the frustration comes from.
To use the analogy of cars.
A 1960's VW bug was the epitomy of the vehicle you could take apart and put together in many ways. Most of those ways would be horrible to look at but it was fun to do so. You learned a LOT from being able to break a car and make it do stuff that wasn't what it was originally designed to do, and you could always mill pieces to rebuild it (which is why there are still so many 1960's VW's on the road, because the parts are easily replaceable).
A 2011 VW bug is the opposite end. It is a very pretty car, and I will say it is fun to drive where it was designed to drive with. It looks a lot like the original, and talks the same talk about being a free love sort of system. But deep inside it is not anything like that. Because it is designed to work and look in a certain way it is very very unfriendly to be changed to look like anything else. It is a pain to mod, and just not fun for that type of person.
The basic message is "You have taken the fun out of modding my system."