If you have a functioning brain and the ability to lab and know what is good in the game you're playing, you don't need to main the cast to talk about them.
Kung Lao has a good mid, he has plus frames, he's one of the most mobile characters in the cast, he's got solid damage, solid fireballs, a launching divekick, launching armor, he has everything you need to be a good character in this game.
While I'm not an MK9(a completely different game) master, I have eyes and can see when a character is good.
This idea of, "you don't play the character so you can't talk about it," is some appeal to authority bullshit.
I don't have to main Ghostface to look at him and say, "Yeah man, a character with a true vortex, command grabs, good mids, and is very safe is pretty good." The same is true for Kung Lao.
In fact, given half of you want him to have a teleport he doesn't need and want him to be a version of himself that existed 14 years ago, I don't think Kung Lao mains are to be trusted.
People that main whatever character is are the worst people to talk to because they ALL downplay, myself included.
Look no further than Reiko players pre-patch. Have a conversation with
@Eldriken about Reiko pre-patch and you'd swear he was a bottom 5 character.
So no, Kung Lao players are on blast.