People saying that Shuri should be a BP is at least understandable, if only because it happened in the comics.
Problem is, that’s all they know (or choose to know perhaps?): that she became a BP. You rarely, if ever, see anyone mention what happened while she was queen and what kind of a ruler she was. What she did as Queen was far more important than her getting the job.
Furthermore, those same folks don’t seem to know that she hasn’t been a BP in almost four years and that she has her own mantle. Meaning that she literally doesn’t need to be a BP in order to be influencial or have a powerup.
The Ironheart thing is still very confusing.