This was basically what we had in TBC, WLK, Cata, MoP, and WoD. Even the casuals can earn a full set of Conquest gear by doing their weekly yolo. Casuals just earned the set slower than highly ranked players. Very few PvPers ever felt the need to buy carries.
The current Shadowlands system ties ilevel to ranking, basically encouraging players to buy carries. It’s the cause of a lot of problems.