I'm kind of surprised you had that many people in there. The couple of times I've been in there this year it has been like a ghost town. A dozen at most.
Club hours in general are disappointing to me. I was in one of the PHX lounges and the lady tells me they close at 5pm so I had to walk down to the other lounge (I guess 2 of the 3 lounges close at 5pm and the other around 8pm).
Same for early flights. Not only are the airport restaurants not open, neither are the lounges.
I guess you can't have everything but I share your annoyance.