What's so bad about mirror go?

[shinuito]

Same opening as

Variant Tournament

Many people also dislike that some people do an early 3-3 invasion, and if they want to play 4-4 stones, then they are forced to deal with it. You just have to deal with it. Play tengen as black, attach to Tengen as white, set up some ladders or capturing races and so on. Here’s Shibano Toramaru 9p dealing with mirror Go against a bot on 9x9 [「マネ碁」に名人の鮮やかなカウンターが決まる！【9路】]

but different move order