You mean like whenever we suspect Kyurem we ban Kyurem on ladder to see if we like the meta without Kyurem? Oh wait, we never did that, we run Kyurem in the ladder while the suspect is going on because the tiering philosophy says that we tier based on the current state of the meta. If you want to get a flavour of a teraless OU you can participate in the OU room tours on Showdown, which a lot of times are teraless. But pre-banning something before the actual ban vote would be setting a very negative precedent, in that the people who want something banned would get it before the fact, and if the vote doesn't go through there'd be clamoring of "hey let's go back to that ladder, i preferred it that way". Things are done a certain way and I'm certain others can give more solid, more convincing and better written arguments on why this is the case, and if you don't agree then go on the policy review thread and explain why you feel like suspects should now be run a different way. My point is that it is disingenuous to act any different in regards to tera and that pre-banning it before the suspect or creating a different ladder is barely gonna sway anyone's opinion.