[Shujin]

I think primarly its not about damage. Like most of the Invocations usually come with some very useful utility. And we all know Exgalfa sucks.

Vydll-> Super good range, disruption potential, AoE Knockdown. overall very strong.
Itensify cold-> for 2 turns you and your whole team basically have fleur for Ice and super ice damage, plus frostbite shenanigans (which I guess ain't that great anymore). I'd argue thats one of the best invocations we have currently. its really good, even more so when your team can Captialize on it.
Isenshi-> Still pretty alright, because of the AoE size, though its new condition is certainly tough to set up on PVP.
Overload-> got hit pretty hard, I don't actually know how strong it is today. Bonus stats are quite normal for people to have so it seems like it be still pretty good with a crit.

The main thing about all of those is, that they all have *30% Damage innate in their class-kit, without needing you to get out of your way. Sure you CAN get that on Solblader, but that does force you to subclass evoker, which argument you can probably make for every invocation aside for the evoker invocations. Its certainly more investment though, than pure envoker

Am not disagreeing though, it doesn't need much. (and I totally did know you can shave off momentum from Lux. thats not news to me. Totally... Real talk though, the 3 "Of Light" thingies need a way to check their description, the info is all over the place.)

EDIT:
Wow, I am an idiot....I actually never knew that we CAN look at that stuff by pressing Shift+Click.
That makes stuff so much easier. Dev, actually smort.