The virgin fextralife vs the chad bg3.wiki
I did notice bg3 wiki actual data mined a bit of info on higher level spells, like Planar Binding is an action, lasts 10 minutes, and has a Wisdom save, all the same as Dominate Person which suggests Planar Binding is basically Dominate Person for Fey, Celestials, Fiends, and Elementals.
Planar Ally is one action has a range, but no duration, suggesting its purhaps like Find Familiar, but with more powerful creatures.