There has not been a single major patch without a critical issue since Endwalker.

[GrizzlyTank]

EW queue wasn't a bug. They just made improvements and optimizations to something that had worked for years. A development server was repurposed as a login server to increase the amount of processing power.

DC travel is not part of a major patch. It's 6.18 and it's just congestion from people using it a lot.

Error 2002 in queue was a "bug" though because the queue for some reason would not refresh, but straight up drop the connection for prolonged periods and then try to reconnect. If i recall the post from a networks analysis from reddit, and it wasn't long after that post that the 2002 error was fixed too...

Alternatively the 2002 error for a full queue was not a bug though.