Thank you so much for this feedback!
I've been working more on the artpass since b1 and, while it's nearly finished now, I really don't mind going back over it to address some of these issues if it makes it a better map overall. I may not make the exact changes suggested but I'll definitely consider the reasoning behind them when looking at addressing the problems.
As for intentions with the map, the large lobby was designed to accomodate forward holds but also provide ways to break them, and the large spawn yard was to discourage holding any further forward than the lobby (i think? it was a long time ago). If these are an issue, or otherwise don't work as intended, I can try and do something about them, but I'd like to see forward holds experimented with a bit more before I do anything permanent with them.