My thing is, she isn't a defending angel. She is THE Judicator
. She is an avenging angel of retribution complete with flaming sword. Here to pass judgement on the enemy 
That said I feel keeping some utility is important.
Personally though, I think Kayle should be turned into a (mostly) melee fighter. Whats the point of a suit of armor and flaming sword when all she does is throw fire blasts from a distance. Kayle ticks me off. >_<
Seriously. I love her character, lore, and core fantasy. She just fails to deliver on any of them. Take a chainsaw to her kit. Give us a real avenging angel.
Give us a polar opposite to Morgana? Do it Riot!
They are sisters on opposite sides and ideologies! (and Morgana doesn't have a kit that constantly has balance problems)
Morg is ranged, Kayle should be melee (she already has the sword). Morg is squishy and mostly naked, Kayle should be a brickhouse (if only in comparason).
Morg walks Kayle flies. Morg shields allies from damage, what if Kayle steroids ally damage?
I just feel her current kit doesn't deliver on any of the promises her lore, splash art, archtype, voice, or even base fantasy aspire to. T_T
Im sorry if I sorta came in here with an entirely different angle than you were hoping for. I wanted to find a thread discussing Kayle changes.