Make too many servers, end up with dead servers and having to merge or try to get people to xfer to them.
Make too few while committed to no layering past phase 1 and end up with nightmarish queue times and chaos as people jump around trying to find a place to play that isn’t awful and which may become awful if too many people try to re-locate to that server.
Long-term layering/megaservers are the best solution that nobody wants to face.
Y’all are acting like this first few days really matters in the overall scheme of things. By the middle of September, everything will be shaken out and everyone will be hard pressed to remember the two bad days at launch.
Thousands of people will probably be asking for it on launch when they wonder why they’re having to wait in a multi-hour queue in 2019 when Blizzard has the tech to deal with it.
They are only using extremely limited layering because they are committed to removing layering after phase 1. If they didn’t limit themselves in terms of layering you could have zero queues on launch day, but you’d need to keep layering long-term (a megaserver style plan).
Since we are making things up: I don’t think anyone will want this aside from you.
If all is not well, Blizzard will open more servers. They have done it already, and will do it again if they need too. I am pretty sure they understand all this better than any of us.