I don't agree making Shuri BP stunted her development at all. Had she not become BP she probably wouldn't have even been used. She was the ONLY member of his supporting cast that anyone else bothered using... and it's not accident that she happened to be the official BP and the ruler of Wakanda at the time. Hudlin was smart enough to realize that making her BP FORCED people to use her. It's the only reason she got any development at all when his other supporting cast basically sat in limbo.
She still needs to build herself up indepenent of T'Challa... but because Hudlin put her on the throne it allows her that opportunity.