I am going to take a guess and say it’s so you introduce difficulties one step a t a time, to work on things incrementally from easier to complex. Since as soon as you have translation, you have to take other things into account, so it’s easier to first do the walk cycle while stationary and avoid the hassle of having to displace the model in 3D space, which would introduce unwarranted complexity to an already complex thing. I think I nailed it and Wayne will say you nailed it.
