Yeah. Its basically to scrap the modified positions. For people who cannot/dont want to stand or kneel, there is an option to shoot a much harder target sitting.
I think we'd all agree that sitting is easier than either discipline. So we can forget about any argument about perceived advantage. And if everyone (well, abled bodied shooters anyway) gets the choice whether to go for the eaiser targets disciplined, or the harder targets sitting, they cannot complain that someone else had an advantage.
Its just a matter of gathering enough (honest) statistical data to derive how difficult a sitter must be to balance out against a given discipline.