The little detail on Ei that she generally sees no wrong at this current point in time in Celestia's methods. Like it's implied by her voiceline 'Only in Eternity are you closest to the heavenly principles' (?) and how that parallels the unknown gods line 'I am the sustainer of the heavenly principles.' Is fun to me.
She's the youngest running archon out of the ones we've met so far, she's only been the archon for 500 yrs and has spent that time in Euthymia grieving her sister and avoiding the fact that theres hundreds of people now relying on her, before the cataclysm she was Makoto's right hand man she was watching over Inazumans but in the form of battle and punishment, caring maternally for the people is implied to be Makoto's thing. So it makes sense that she'd look to Celestia for guidance, she has no principle to base her methods off otherwise that wouldn't be a complete change of character and I'll enjoy the progression of Ei learning her own methods independent of Celestia now thay she's no longer pursuing eternity and thus the heavenly principles.