we already have crossbows and stones. Every cannon fodder can use it without any investments.
You're quite right.
Thus Cavalry and Ranged are not a class in cRPG, since any melee can shoot bolts and throw stones and travel on a mighty donkey.
We only need an improvised Short Bow which would require 0 power draw and does ~10 cut damage and we will successfully have removed all classes from cRPG.
In all seriousness, every classes have easy hybridization choices, its all a matter of being supremely efficient in one path, excellent in two, or good in more.
Then add individual skill on top and you got +oo scenarii where there is no such thing as "the ultimate being" but being good at what you do.