How long is your EM? If it's 6 to 8 weeks, then I agree with you.When you ferment in a Brute, how soon do you transfer to carboys (or other sealed containers)? I've considered this but I've started running EM on pretty much everything I do so containers like this don't work for me. I've been considering purchasing a large fermentation vessel that seals tight and has airlock capability to get around this challenge.
If it's a couple of weeks? Wine is heavily outgassing for a number of weeks post-fermentation, so a short EM in a container that is not perfectly sealed should not be a problem.