It seems to me that no one answered the OP question. WHY are the better drivers better? The closest thing I saw was:
Features like stall detection, anti resonance, full step morphing, and many others.
So, for each of these features, it makes sense to ask - Why is this a good feature? What are the benefits of having these feature, or potentially, the adverse consequences of not having the feature? It seems that was what the OP was about, but he tended to get exactly the sort of answer he wasn't looking for.
For a DIY builder, it is nice to know *what* compromises are being made, not merely *that* compromises are being made.