The question Why does Wrestling and BJJ exist when Sambo and catch-wrestling are more complete arts? is off topic and needs to be closed.
The question compares multiple arts and talks about which is more effective. Not only is this opinion based, but it is marked as off topic in the help center.
Since the author of the question states his controversial opinion, this is very likely to (and already has started to) start arguments in the comments about whether martial art A, B, or C is better.
Please use your ability to close questions (if you have it), because this one is undeniably off-topic. If someone would like to defend it, however, I may just change my mind.