I care about mob level because I simply enjoy exploring areas & mob grinding, (without one/two shotting things) ... I'm not into the story, I won't PUG, (especially on my tanks and healers, which are the classes I enjoy most... too much vitriol tossed at tanks/healers for wipes even when it's not their fault).
I have 2x sub 30 classes for exploring sub 30 content, 2x 30 jobs for exploring 30 - 40 content, 2x 50 jobs for exploring 50 - 60 content, 3x 60 jobs for 60 - 70 content, 1x 70 job for 70 - 80 content, and 2x 80 jobs for 80 - 90 content.
I only get to play 2 - 4 hours per week, and I have RL friends who play on a different server. When our schedules align we have a static group we play together; I'm the healer, lv 23 Conjy. This is where I do the story/MSQ, and why I skip it on my "main" character/server.
This is just how I enjoy my game time