The Golden Dawn / Crowley teaching that one must make contact with one's Holy Guardian Angel before one can progress in magical and spiritual development has rigidified into dogma in Western esotericism. Do you think this is needlessly limiting?
Yes it is needlessly limiting.
The concept does not exist in 90% of the worlds magic systems, and they get along just fine without it.
It is a useful endeavor, but it should not be seen as necessary.