Yes, a platform is a place to get a bite. And I think the main reason that some of the points today look better(to some, anyway), isn't necessarily because of the tools available...some of the best work I've seen is done by abo knappers with historically correct tools. I think that the reason is because knappers today have all the time they want to make a nice point, and aren't depending on it to survive.
I have never seen anyone use a diamond grinder in a dremel tool to abrade. I would think it would be way to much. Most use either a sandstone rock, or some type of grinding stone, like a whetrock or piece of grinding wheel. The platforms will crumble if they aren't abraded for strength, so that is a very important part of the knapping process.