This is one of those debates that can go in forever. Like some have said there are people who believe that "doing it the way they had to do it". And others that don't think it's necessary to screw up "x" amount of blades and whatnot either. Take woodworking for example there are jigs used all the time in that craft for all kinds of things. Should someone "have" to become a master at hand cutting dovetail joints before grabbing a router and a dovetail jig? If so why?
Think of all the different tools and jigs used in wood working that are used to make joints, edges, etc. Who would agree that they believe that a person interested in wood working should be able to perfectly make box joints, dovetail joints, mortise and tenon joints, etc. by hand before making them in a jig?
There are people in almost every aspect of life who have become extremely proficient at something and it took them a lot of practice to master that. Now no matter what that craft or skill set it is it took a lot of practice and likely blood, sweat, tears, and likely some heartache to get there. Maybe some people believe that others should have to "suffer like they did" so to speak to get to a certain stage. But If there is something that can cut the learning curve down quite a bit I don't see where the harm is.
There is a debate among archers that has been around as long as the compound bow has been invented between compound shooters and traditional (recurve, longbow) shooters. The traditionalists talk about the "training wheels" on a compound and how there are guys who can literally shoot asprin out of the air with a stick and string that compound shooters can never do. However the VAST majority of compound shooters have and will maintain more accuracy than probably 99% of the traditionalists do. Their argument is "Man has hunted like this hundreds of years before the "training wheels" came out".... Of course they often leave out that the bulk of it was done in groups and everyone was flinging arrow at the same target, eventually a few of them will hit something vital

.
Personally I think the bottom line is: If what you do helps YOU accomplish YOUR goal then who really cares. If someone grinds freehand, with a jig, with a file,, or with their feet does it make them any less of a knife maker?