Yeah, my old race seat put me so much lower in the NA, it felt like a different car.
So, the removal of the shovel or blister on the bottom of the OE seats would be useful if one were considering lowering the rear humps on the rear mounting points. The shovel is what stops the seat from moving back any further when it contacts the floor. I would think similarly if someone were to remove the front mounts to achieve a flat floor that having a flat-bottom OE seat would also give you more adjustment for modification. It's a viable solution to working/modifying OE stuff to achieve a lower seating position, that's all.