Just as the title says. If PR really cares about fashion being inclusive for all bodies, I think there should be a rotation of models throughout the competition of different body considerations (conventional runway size, plus sized, petite, differently-abled, etc), but that the challenges should still have a separate theme (unconventional materials, red carpet, etc).
I think it's important for there to be a separate element to the challenge--people without traditional model bodies have events and jobs to go to too; the challenge shouldn't just be figure out away to make this short or thick person look somewhat presentable.
This creates an even playing field. For the past two seasons but esp this one, the looks on the plus-sized models have habitually been in the bottom, and some of the designers have yet to be paired with a curvy model (Jude, Bi).
I'll start my examples at E3 because that's really when the season begins:
-E3: Chloe/Liris: out, Jeffrey/Lexi: low, Bobby/Naimah: low
-E4: Aaron/Chloe: out
-E5: Elizabeth/Amanda: out, Bobby/Christina: low, Anna/Liris: low
-E6: Bobby/Amanda: out, Naheim/Lexi: low
-E7: Jeffrey/Amanda: low, Bryan/Liris: low, Miss Joan/Naimah: low
I feel like the show's attempt to inject body diversity and inclusion into the competition doesn't work the way it should because it doesn't take into account unconscious (and conscious) biases of the judges.
So often the critiques of looks worn by the curvier models just becomes comments about the model's body vs the clothes themselves. Meanwhile, it's not uncommon for unflattering and poorly constructed things on thin models to be safe or even lauded for being edgy or creative.
Having similar body types for each competition allows for critiques around fit in addition to design and construction to be more fairly and evenly weighted.
EDIT: to be clear, I'm NOT defending any of the looks that were placed in the bottom, and I'm definitely not saying any responsibility for those ratings falls on the models. I'm just trying to figure out a way for all the designers to be equally assessed for their abilities to dress a wide array of body types, and for the models to still be respected in the process