Quite a lot of time? Beta 4 started less than 2 weeks ago today, and ended 9 days ago. Early Access started just 5 days ago. Beta 4 showed that they had some problems with the load on the servers and dealing with that load, and they have been working to fix that. But when Early Access kicked off 5 days ago the level of demand spiked higher than Beta 4. Leaving them no choice but to find a way to stabilize things for now so that they can expand to handle the additional users.

Five (5) days is not enough time to analyze the situation, make decisions and change data center infrastructure. In fairness you have to remember that they added at least 5 new worlds during Beta 4 and Early Access to NA/EU, representing a 25% increase in total capacity. Seriously, there have been only 12 days between Beta 4 and now. They're moving as fast as they can, and a good deal faster than most organizations can.

The game launched yesterday and due to the high demand (which is a good thing I guess) the servers are at maximum capacity, so now they are suspending digital sales and adding more physical servers to the data center and getting it done in under a week. That's actually not bad for acquiring new hardware, doing the OS build, network integration, application/server build, and integration.