This subthread about the documentation is a great idea. The UE4 answer hub is like hit with an avalanche in 2 minute intervls with basic question, which kind of reflects that the documentation in its current form is not ideal.
I am using Matlab on occasion, and they have a very nice documentation style.
If you have a license, there is even more indepth on top of this, like Rotations with axis&Angle, Euler, Quaternions and how the all play together and so on.
In UE4, no one even know the rotation order, except for the one developer who coded it.
Essentially, they push their developers to write more than one sentence about a feature.
99% of the user base will not use it, because a) they won’t know that it exists and b) if, then they don’t know what exactly it does (no example)
This is especially true for the now free UE4, which will attract lots of kids and younger people, who have no idea yet of what a dot product is.
Here we say: why even implement a feature first place, if it is not fully documented. Those who find out in code how it works, can do it themselves, and all others won’t use it.