It doesn't even break 400 unless you use MB trait.
The only way to stop this move is to react to is a false statement. It being reactable doesn't mean you can only react to it. Especially if players are yolo teleporting. You should, like, expect it right? Cool, walk forward and full combo punish, you're welcome.
And no, it's not. Online doesn't equal auto horrendous connections. In a solid connection it's not an issue. In a bad connection of course it is, so is just about every other possible thing in lag. Lag/delay sucks, also water is wet.