You cant talk about something that you dont know isnt?
but there are a lot of people out of cup currently, so there are already people who could talk about what they experienced.
I would love to see those tactics on the PL's since the glory that you get from them is nice, but for me much more important is to test things, even if that means that i will lose some games.
i also test a lot, but i am quite sure that they are also people who want to win a Pl, and when the BB release a tactic which is way to strong or weak, it could destroy the fun for them. But they want to release it for the PL this season, so i thing you could try this tactics soon.