Renaming a folder isn't trivial because you can break chain of inheritance, or cause scenes to have missing resources. Godot devs just aren't spending their time testing stuff like that, because it's not a feature, that's like saying you purposely want to break your project but also Godot shouldn't crash. Not high priority
Compound this the UIDs, .import, and .godot files in 4.0 still seem to be in a state of hammering out issues, so the last thing I would recommend is renaming folders full of dependencies, unless you are doing careful file search+replace outside of Godot to do it