Your main concern for a C kite might be about positive and direct feel at the bar.
Somebody else might feel that having good solid pull through turns/transitions/loops is what a C kite is all about.
A third person may feel that a useable unhooked pull on a C kite is what is most important, as opposed to what you get when you unhook with an SLE/Bow.
The no backstall feel that is more common with C kites is one of the reasons I like them better than sle's which (even the Rebel) all seem to stall far more readily than a C shaped canopy kite.
Slack line after pop for passing the bar is super important to some, and means nothing to and old hooked in dangler.
I believe a C kite is a C kite when the canopy is C shaped, but it is just an opinion.
We have many variations of C kite now, but none of them are bow/delta-ish shapes.
I agree that talking about "pure C kites" is nonsense these days, if somebody wants to label a kite a hybrid C kite, then great...whatever.
The term SLE is no longer really a way to identify a kite type, everything currently but a Fuel has a supported leading edge, I think?
Some used to think that the Vegas with the super slanted tips was not a C kite, ...so is it a C kite now?
A loaded fifth is a bridle (SLE), and in the case of a Vegas, it is attached at two places to provide support.
If a Vegas is a C kite..then a C4 is a C kite.
If a C4 is a C kite..then a Prime is a C kite..etc, etc.
.....but we all know an RPM is surely not!!!