I think most people would accept that they have finite capacity and you might need to wait a bit, but what seems suboptimal is the lottery style allocation of Stage 3 and inviting more people for it who applied more recently, who might get lucky ahead of people who were invited ages ago. It shouldn't come down to luck of when you click a link. This isn't ticketmaster. I would have preferred to be allocated a date without any choice over this process. Once you get a Stage 3 invite, you'd think there would be capacity for you.
Personally I've stopped waiting for anything now and accepted Stage 3 won't happen. They clearly have an excess of people which is great for them