Tbh more i think heroic like in wrath is best..Though not opposed to mythic.
And again it's more a feels good thing. Like you can shave alot of time off encounters and by the time done getting it all if it takes ages bam you feel pretty good. Depending how it happens even one piece could just feel good.
And an idea occurs to me that you could if just crafted gear that a reward for a daily or weekly quest(or once a day roulette reward) and make it so every 1-3 weeks(depending on slot) you could get enough to have a piece crafted. Ideally most anything could reward saud items so say raiders could get alot from raids, mythic plus a bit less and world bosses less then that witth dailies/quests the lowest but most guranteed.
Everybody could get the same gear but the rate would differ on how hardcore you play