The load floor on my Corolla hatchback is high because it has a spare tire back there. It seems like every small car is dropping the spare tire now. Another thing that killed the Corolla HB space efficiency is the wheelbase. The wheelbase is 2.5" shorter than the sedan. The slope of the hatch seems to start like 10" above the load floor and has a pretty severe slope to the roofline so that further makes things feel small. I think the Corolla sedan wheelbase and having the overhang on the rear not quite as short would have made an enormous difference in where they could have placed the spare and the fuel tank which would have then allowed the cargo floor be a few inches lower which would have really opened up the space efficiency back there. UX has the same short wheelbase of the Corolla HB so it suffers similarly. I like my Corolla HB, but it would have been better received to the US market if it was Americanized. Then again, maybe it doesn't matter. The people that care about space efficiency were probably happy to go get the sedan instead.What I have seen is that the GA-C (Corolla Hatchback, UX) and GA-K (Camry, ES) cargo area load floors are high off the ground. That gives cars on those platforms vey shallow and small cargo areas and trunks (smaller than their competitors is the common complaint of reviewers).
I would like to see if there is any difference between the load floor height of the FWD Corolla Cross (which has a low torsion beam rear suspension) and the AWD Corolla Cross (which has a taller independent rear suspension).