I believe myself to be a casual. I play for an hour or so on weekdays before checking in for bed. I play for longer sessions on weekends and usually at night. You can see my profile as I main a DK and it’s pretty jank (for proof, lol). I think this expac is casual friendly.
The Covenant gear and the slow grind to Conquest ilevel 200 weapon is attainable for those that are not as skilled like myself. I fill out slots with world boss drops (If lucky), LFR (2 wings!) and low mythic keys (4 or below). You also get another weekly chance with the vault.
Unsure if you’re aware, hopefully you are, you can actually upgrade your Covenant gear (all 9 pieces) to ilevel 197 eventually. Combo that with a piece of legendary that you can grind gold for (Should have enough by the time you hit max level) to get a 215+ ilevel piece. All in all, you have access as a casual, playing a little bit here, a little bit there to have close to ilevel 200 gear in all slots.