That's right. Usually, in such topics, there are many arguments. But about what? One, for example, is good at playing as Necromancers but doesn't know how to play as Sylvan, another is good at playing as Sylvan but doesn't know how to play as Necropolis (as he said!). Then someone declares themselves a pro at Inferno, but plays poorly as Sylvan and Necropolis, and they start arguing with each other, without finding a common solution. Everyone remains with their own opinion.
I'm not questioning the professionalism or correctness of each participant in the discussion, but it's likely that their discussion is dominated by the FACT described by SandroXXL.