Back in the day, people got tired of being forced to PVP 24/7 and Blizzard designed War Mode for those who wanted to opt-out of that activity.
Furthermore, they separated the contamination of PVP/PVE by making the gear nearly incompatible with the other mode.
Problem solved.
Much later, Korthia came out and World Content enjoyers were given a cool zone to explore with tons of Mounts, Pets and Transmog to collect.
The problem was that, instanced-content enjoyers felt forced to do that content because it had features that were DIRECTLY tied to player power.
Contamination between instanced content and world content. It created strife and instanced enjoyers were not happy.
I see contamination bleeding from M+ into raiding.
Raiders aren’t always M+ers just like M+ers aren’t always raiders.
It’s time that those game modes become detached from each other and from World Content.
I know some raiders who don’t like being forced into the vastly more efficient gearing method of M+.
They do M+ not for the enjoyment of the activity, but to stay viable/competitive for raiding.
I know some World Content enjoyers who would be happy to never step foot into another dungeon/raid/instance ever again.
If Blizzard can detach PVE gear viability in PVP (and vice-versa) then they can do the same for World Content, M+ and Raiding.
World Content players won’t have to listen to M+ers and Raiders telling them to, “git good,” as that gear won’t translate into World Content.
Raiders won’t feel obligated to run a mode they don’t enjoy in the world of Mythic Plus.
After all; why should anyone be forced to play a game mode they don’t like in order to progress their character?