I think many forget on why there were so many issues with congestion at the start of Endwalker. There was a surge of players coming from World of warcraft at the time due to very high streaming some from Esport teams coupled with a new expansion there was congestion to be expected. Then we have to remember that at the time there was a very big shortage on semi conductors and Square enix was unable to expand their servers. So yeah, while there were problems with logins and disconnects, they did fix it as soon as they could. Yoshi made a comment that he was confident that it would not be a repeat since they have a larger capacity in server space and the ability to create additional worlds. We shall see.

You should be expecting login queues, long ones for the largest population worlds. You should expect bugs and maintenances and further down time. This is consistent with every single MMO on every expansion.. If you call off work on day one and can't play. That's on you.