I don't think so. Do you remember the balance machines that would spin a tire/wheel while mounted on a car? I had one where the normal speed at the time of 55mph a balance was just fine. But when I got a lead foot and open road it would shake the heck of me at 120mph. So in the previous example of balancing high for a motor, does it too have a spot lower where things are not well balanced or is the above example I have just specific to that style of balance machine?
Both of your points are good, and I agree somewhat.
The case for the engine, is valid IMO, but we may need an engine builder engineer to help us with it. I decided to quote Henry Royce, who wrote that about 100 years ago when engines ran much slower. His engines were very smooth, and had some pretty advanced pieces in them.
The tire spinning, causing a larger gravitational pull as it increases in speed. Trying to send the outer bits in to orbit.
The balance problem has to get worsa as the speed increases. I suggested that if it had not happened by 150, could we assume it was okay at 200. Further, if we balanced the wheel correctly, we should not have any problems. A slightly out of balance wheel would show itself at some point. I think we need to chat with a Ducati MotoGP mechanic, and ask him or her, how they balance their wheels. I am positive it will not be using a shaft, smaller than the hole in the bearings. Another issue with higher speeds is the tire losing shape, or coming apart. Barry Sheen at Daytona, had the tire expand and rub on the frame, and blow at around 180.
For most of these things, we have to be like Einstein and do thought experiments.
For the engine: Mass changing direction, and piston speed are the main issues. The main problem with long stroke engines. I have BTDT.
I have run many times, maybe thousands of times at 145, and would have gone faster with more giddyup. But I have not run 200. The MotoGP bikes do it every lap on most tracks. UK