I'm assuming that was because so many players were already playing when GS opened, and many of them were extremely excited about it, so they all rushed in like battering rams to get the first cacpot tickets and have the best chocobos. I really didn't care, and only first checked out GS a few days ago, so guess what: I had absolutely no idea there was ever a lag or capacity problem. And I imagine that Saturdays get pretty busy, but otherwise I've never had a lag problem, never had a capacity problem, and have never felt like "there are too many people here" since setting foot in GS (and I'm now almost a daily participant).
Why was there ever such a huge problem with server capacity after 2.0 went live back in the day? Because of all the players rushing in, adhering to their uncontrollable excitement... not because of game elements that improve our characters' quality of life. ;/ My point is... since a few weeks after 2.0's launch, and a few days after the launch of GS, have the issues honestly been as bad? To be perfectly honest, I haven't noticed what you're talking about at all.