as far as I can tell "doing it on purpose" has not become a trend yet
and so far I've not encountered much insistence on the practice on this forum
it seems to me that the majority of our members prefer not to muddy the gene pool, and are sufficiently outspoken about their distaste that it ought to give a clear message to newcomers
as to what you call the offspring of two subspecies that don't qualify as intergrades, that's simple. you call them hybrids. crazy, yup, but pretty accurate