1. Must level all toons to 90 in order to get the most profit from your toon.
2. Must continue to grind with those toons that need SoH in order to continue to craft.
3. Crafters have to have them, and the only way to get them is to GRIND
Yes, alchemists, Jewel Crafters, and enchanters can get the basic level 600 consumables but in order to get the true raiding consumables they will need to level to 90 and then become exalted across the board.
Blacksmiths, Engineers, tailors, Inscription and Leatherworkers are going to have to grind SoH and Rep now in order to craft the gear that everyone wants.
Blizz truly figured out a way to ensure that you level all of your alts as well as ensure that you grind them. SoH tied to Rep is required for any kind of meaningful game advancement.