Yeah but, its apparent a massive chinese server farm can use brute force pretty well if your running millions of systems - and most people on average will use a word and some numbers, like
'password 123' , 'password 213' etc
If you do it enough you can build up further data of the common ones, while computer programs see no different - humans do - so you program the computer to hunt as if simulating human thinking for passwords, the structure and common layouts etc.....
However if you have a password manager -- store that file locally -- and every single one of your accounts is a 64 digit random caps/small/digit/symbol .......... then you step away from common patterns and every single account you have becomes a nightmare for hacking farms - and even if billions to one they guess one single account, then it doesn't matter, all the other ones are different.