They might be nerfing T8 delve rewards.

Taken from a thread over at https://www.mmo-champion.com/content/12854-New-Zone-in-11-2-Dev-Interviews-WoW-China-Growth-Mountain-Dew-Event?#comments

There was an interview with Windows Central. While it covered a few things a couple comments were made about Delves.

*Players hit Level 8 delves and earn powerful rewards, making it feel like there is no point in doing anything below Mythic 7, which is already fairly hard.
*Mythic 7 isn't the best point of entry for players, so some are hitting a cliff wall instead of doing earlier Mythic+ tiers

Personally this seems like a really bad idea. Delves already have difficulty levels that don't even reward more powerful loot meaning nobody really does them. If t8's get nerfed then it will make delves even less worthwhile to do, make more tiers pointless, and will make the season boss like Zekvir? and ?? (who already doesn't reward loot either) harder and more pointless to go after without dipping into completely unrelated content.

The issue seems to be that they think this makes M+1-6 pointles to do and.. that isn't going to change from nerfing delves. I don't know anybody who has trouble powering through those into +8s. They aren't really designed to be worth it for the loot they are the tutorial for doing actual M+ tiers.

This would have to be a HUGE nerf to delve loot to make m+1-6 worthwhile. Basically dropping Delves from Champ gear with Hero in the GV all the way down to Vet gear with Champ in the GV. Nobody would bother anymore. Especially when you could get better or equal loot doing LFR or Timewalking.