There are many reasons why they could be splitting the patches; hell people have speculated things from download size to 'planned emergency maintenance'. But that's all it is, speculation.
2 days isn't going to make or break load size, that's just more downtime~
And no one said anything about being unhappy, people can try and paint this thread as another QQ thread, but that's not the case~
Even though the maintenances are eating into our playtime, we understand and appreciate that downtime happens, it's an MMO. But at the same time, we just wish that they weren't so.... numerous as of late. Weekly I can understand, and that's fine, but over the last 30 days, 8 of those have been taken by maintenance.
As for the troubleshooting; they have test servers for this :x. Yes, things can still go wrong here and there, but the main bulk of testing has already been done~
Have a wonderful day guys! :3