With the new optional reagent system, we can apparently turn a vast array of crafted equippable gear from prior expansions into "later game player at the end of the expansion" level gear for alts crossing over into shadowlands. I just happen to have one of almost every crafting profession on characters dating back to WOTLK who will almost certainly get used for their skills to do just that in the future, but in deciding where to focus my new 120 jewelcrafter to add to the pile, I find myself starting a debate in my head that I thought I'd ask outwardly to include others, thus this thread.
Considering ease of use, availability of components, and other personally preferred or relevant variables, which era (in this relatively new world of all the eras being their own profession bar) would you recommend a character starting a crafting empire to feed gear to an alt army with this new optional reagent system, and why? Feel free to break it up from profession to profession!
I'm likely taking my new JC to northrend because I know it well and the rest of my ancient empire of crafters date back to a time when I cared to maintain every craft, so any interdependence will be well supported. On the flipside, I think I'd recommend against legion in this discussion because of the recipe ranks system
What do you think, profession-minded and potentially altoholic veterans of WoW?
Thanks in advance for any and all helpful replies!