Can we mark that as two....
Thanks David more a curiosity than anything else at this point.
I don't usually post, just lurk and read because it is always interesting.
However, this thread is a mirror of where the machine tool industry found itself in the 80's. Trajectory planning, ball screw compensation tables, etc. were the new and bleeding edge, and the same arguments were had. Long story short, we take these things for granted now. While @deckingman is 100% correct (and I really like/appreciate his systematic approach), he has exposed the next hiccup in the "need for speed". This also happened in the machining world which led to advances in tool materials and geometry, and in particular cutting strategy.
Someone, on another forum, at this moment could be figuring out how to extrude the volume required to travel at warp speed, which would put the ball back in motion controls court.
I also get the argument about build quality, but, while everyone wants a Dixie, most have Haas'es and it is a bit unrealistic to expect otherwise, particularly in the DIY space.
Also we are up against the reality that one very bright man who seems to live a 36 hour day is creating and maintaining the software we are using. Trajectory planning will eventually be a requirement to any 3d printer firmware, but right now, for practical reasons, it will fall into the "nice to have" category.