It bothers me that types as representation of hardware constraints are mixed up with types as a machine readable subset of validation.

It makes the higher level types seem more transcendental than they are, and also seems to put actual validation on a second rate level. End of the day if an argument is the right scalar or interface you'll get the same result on runtime whether you hinted it -- for one's quality of life improvements -- or checked it with some boilerplate validation. Worst case scenario people will forgo encoding known stricter constraints after generally hinting the expected type.