No, champions arent "strong"

Braum is pretty strong. Dude stopped a mountain from collapsing.

is strong, but not OP. He has counterplay, which is dodging the stun and itemizing against him. His Q is also pretty easy to dodge, ward to prevent his flanks = he's never going to hit you with his E = you don't die. He does have his "oh no I got outplayed" R button, but with enough burst you can kill him before he uses it or just cc him.

He's strong because he has a great laning phase, he's safe, he can splitpush as well as teamfight decently and he just fits well into every single comp. He's very hard to 1v1 and you can't really force anything onto him because he has the tools to stop it with his W, E, the slow on his Q, his core items Zhonya's and Protobelt, and ultimate. He can carry as well as roam.

I don't see what you mean?

No, strong is another word to say "very viable" rather than OP which is a way to say "meta-defining viable"

People just throw the words "OP" around loosely which leads us to threads like this, where people don't actually know the real meaning of these terms