This is my point as well.
I'm not denying that you can tell the difference between a hot load and a reduced load; I just don't think that, if you're using the same rifle, a reduced-recoil load will actually be the difference between learning good fundamentals and developing a flinch.
As a side note, it's worth re-emphasizing the point made above that proper ear protection and eye protection will go a looong way towards making shooting more comfortable, especially for learners.
Eye pro in particular is underappreciated in this regard. Nothing like a shockwave to the eyes to make you flinch!