What's the definition of genital inadequacy?

It isn't always the man's fault...and I don't think that "fault" is the issue, anyway. Sometimes it's simply circumstance... But where there IS a problem, since, as you pointed out, there are apparently no effective 'vaginal constriction offerings' on the market (and I'm sure this is being researched as we speak) other than Kegel exercises...which incidentally, only marginally work, particularly in women of a certain age, the next most logical conclusion is to adequately enlarge what can be, rather than constrict what cannot...