Word you're right. Potentially have to wait at most 2 minutes in QA, given that it's very accelerated and regular dojo size. Doesn't seem like much of a "flaw" to me, but...

Unfortunately the criticism gives the impression that it come from a place of entitlement.
Additionally all that needs to be done is to ask a room if anyone wants to 1v1, and more often than not someone will.
They might claim that it's not a solution, but an alternative - at least I have an idea of what to do about impatience.
It isn't much of a fair suggestion, considering they don't offer any suggestion and there is a way to avoid waiting, but it's refused.
Just makes anyone taking that stance sound... unpleasant.

Unless someone can offer a suggestion it doesn't seem like much more than whining that they have to wait. Not trying to be rude, it just feels fairly obvious. Yes, you have to wait, it's a queue based system. Come up with a solution or an alternative, or grin and bear it.