One thing I didn't mention in this video is the crest upgrade system - that ended up being something not super relevant for gearing because it's 1) a very low exchange rate and 2) it counts against the weekly cap of what you're upgrading into, so use it if it helps you but it doesn't really change gearing plans for optimized characters at all.
Here's the infographic from reddit: https://www.reddit.com/r/wow/comments...
Tier drop change: https://www.wowhead.com/news/less-tie....
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