Seems like Blizzard expects everyone to participate in all forms of content. I imagine that if you map out the drop rate based on participation in PvP, Raiding, M+, World Quests and related events like World Bosses and Callings, you’d probably see an expected drop rate that most players would be satisfied with.
Skipping any of those is like skipping food groups in your meals. You’re expecting to get all your nutrition from a few limited sources.
I’m not a fan of that design approach, since I’d prefer to focus on the few types of content that I most enjoy.