Oh for sure, divine keys are just filler. The only one with real lasting power is Shamash, and Judah is technically a key too, but that's something else.
For stigs it's always what you can get your hands on, I do like the Marco Polo pieces, Ekatarina M is fantastic, but that's about it for physical options from the foundry, gotta look for banners or event stigs. Oh and Jingwei T vs boss only stages.
Other than that it's some basic stuff and select event stigs. Always the hardest part is that alot of stigs exclude the burst state for buffs or have a short duration, like Picasso T+M is great, and the buff will apply to Miko's ultimate, but her startup is so damn long as well as the duration, that the buff and debuff effects will wear off well before you finish all the damage you have.