Why? Because the return on investment for any one of the mounts introduced is too low. I don't have the gold to randomly fling at things like mounts that will be used once or twice and then forgotten about. As for the tailor, the pattern for the Royal Satchel is locked behind the absolute, hands down, worst reputation grind in the new expansion -- and there's no way to get around that. I either have to log on every single day to grind out dailies that give an absolute pittance of reputation, or try to solo Warbringers, which is next-to-impossible for several classes.
In short, none of these things are worth my time or gold. As a result, the majority of my professions have been completely unused for the majority of the expansion. And I have a sneaking suspicion I am far from the only one, here.