With MF and my genre of work, I very rarely go beyond 1/30 second and nowhere near the 1/1000 snitch of a heavy-hitting P67. The highest I've ever used is 1/2000 years ago with my EOS 1N and 85mm f1.2 (a once only event; the lens was then disposed of). It is unlikely you will need very high shutter speeds with medium format; it is not the format for high speed action e.g. sports, of which fast and nimble 35mm cameras are much better suited. Some portraiture requiring high flash sync speeds may call for a Tv of 1/250 to 1/500 (e.g. with leaf shutter lenses), but otherwise ... — ?
Very high quality glass ND filters exist that do not compromise image quality (unless you deliberately invoke flare), but resin filters can impinge upon aspherical/apochromatic lenses and should be avoided in those circumstances. Consider matching the quality of the filter to the quality of the lens."Yes, there are various ways of overcoming this limitation on a brightly lit situation like stopping down or using a filter etc. but this might compromise image quality which voids the whole point of having a MF camera IMO."