I've seen some posts offering suggestions on improving loot, here's my take:
I'm utilizing this tier's ilvl as an example.
Outdoor content, including world quests, are repeatable and offer i185 loot. Think entry level here.
Introduce solo-only repeatable world content that unlocks the ability to upgrade i185 loot to i200.
Introduce weekly locked content that offers the ability to grade i200 to i213.
The idea is to offer a stepping stone into group content, but should never grant gear that is competitive to it. Harder solo content can be unique cosmetically to incentivize participation.
Heroic dungeons are off-lockout and spammable for base i185. Again, think entry level here.
Mythic dungeons are off lock-out and spammable for i200. Think more challenging. Actually require coordination at early ilvl's.
Mythic+ dungeons continue to stay off lock-out and drop scaling gear, capping at i213 for +15's. Alternatively, you can use valor points to upgrade gear to a max of i213.
Mythic+ gear can then be further selectively upgraded to i226 gear from trophies that are dropped from your first completion of a +20 for the week, via a vendor outside of each dungeon.
With the introduction of the new in-game rating system, introduce "PvP-like" ratings with unlockable mounts, titles, and transmog for reaching certain rating. Offer unique titles and mounts for the highest rated players on the server. This incentivizes competition and replayability.
Fucking. Remove. Looking. For. Raid.
Make normal mode raids off lock-out and spammable for base i200.
Heroic raid are now off lock-out and are spammable for i213 gear; in addition, valor points are awarded to upgrade i200 to i213.
Mythic raid continues to stay on lock-out with the chance at receiving 226 gear each week.
PvP unranked gear is earned through honor points, which are grindable via unranked combat and offer i200.
PvP ranked gear is earned through conquest points, which are grindable via ranked combat and offer i213.
PvP gear can then be further selectively upgraded to i226 from trophies that are dropped from your first win at 2000 ranking and above per week.
The idea is to give everyone the opportunity to grind the base gear they want through content they want to play. If you want the max ilvl of gear, you have to play the game on the hardest respective difficulty. Remove generalized time-gating and allow players who want to put in more time the ability to get more gear.
I believe that i226 gear should not be significantly stronger than i213. Perhaps a max 10% upgrade, and should be more cosmetic in nature to show off the players accomplishments/skill.