Oh I totally agree and have always hated 5v5 myself. But unfortunately 6v6 becoming the main format depends on the numbers we show them during these playtests. Unless they see the numbers/data backing it up, it will not come. If you want to support 6v6 becoming permanent you should be contributing in the numbers to show them this is what we want.
Like I tell everyone during elections. If you don’t vote, you have no room to complain if someone you didn’t want gets in office. This kind of works the same way.