Ratskinner
Adventurer
In other words B/X D&D has no monopoly on simplicity, and has many non-simple things in it that existed purely because it was closely based on OD&D, not because they made sense. We're past that now and don't need to go back to get simplicity. Nor do we need to have things like "must have a cleric" or casters that end up far outstripping any other character, nor arbitrary class/race restrictions, etc.
must spread....