I know there is zero chance of this for One D&D as a result of the enormous traction of "tradition," but I wish that WotC would take a step back and critically reexamine what archetypes are mechanically or thematically needed for D&D for much the same reason as you mention here. I don't think that the whole "where you get magic from" is really strong enough of a thematic difference if there is only marginal mechanical difference: e.g., spells known vs. spells prepared. IMHO, there are more robust thematic archetypes that D&D could use for its classes.