Blizzard should just make two different servers. Clearly there are irreconcilable odds between what hardcore players want and the game direction.
So, they should add Mythic servers. It's hardcore and has all the quality of life deterioration that hardcore players apparently want.
1. Only Heroic/Mythic difficulty Dungeons and Raids. No LFG/LFR or Normal.
2. No Paid Boosts.
4. Old school gold cap of 214,748g.
5. No pity-loot Tokens.
6. Personal loot RNG chance is half what it is now.
7. You get three raid lockouts per character per week.
We could come up with dozens and dozens more masochistic game design decisions. Like, iLevel deterioration over time, or 10 minute death timers that make you solve a calculus problem to rez early.