[Shujin]

I know its not exactly like that obviously. But if you compare it with something like...Divine Shower for Example. you use your invocation to effect all enemies. You deal damage, blind them. Good stuff.
Shine knighting buffs you and only you. Thats a thing that people can either ignore, deal with in any way that Shine Knighting does not cover/or because they are immune to it, etc. Its not momentum efficient for an invocation. Most invocations are AoE when they are considered good.

I guess we have to agree on disagreeing there on how good that weapon is, in a feasible build. Its mediocre at best imo.

And it does not HAVE to offer them, but Shine Knighting would be literal garbage if it didn't. Most people you fight would not be effected by it at all. Meaning no its not a good invocation, because its not a good invocation as it stands. those immunities are basically the only thing that makes people even consider shine knighting. The pseudo blind isn't all that great in most cases and can be acheived easier.

No ones saying Do not take it from them to make it fairer. But prertty much everyone who actually uses Shine Knighting says "its actually not as good as people make it out to be."