Actually the hollowing space is a continuum and not discrete. Picking few discrete points in that space is just that.
At certain point the flex of the blade becomes noticeable.
New people don't have light touch so pushing too hard on a blade with quite a bit flex gives them poor results, the razor actually cuts worse, not better.
Feedback is a great thing to improving one's technique.
There is no difference in heft between full an half hollow. The difference in heft between razor comes almost entirely from differences spine thickness, not from the differences in hollowing.
More mass = less feedback = masking user errors.