"The more they overthink the plumbing, the easier it is to stop up the drain." - Scotty, and good IT people everywhere. When you add all of the necessary layer

"The more they overthink the plumbing, the easier it is to stop up the drain." - Scotty, and good IT people everywhere. When you add all of the necessary layers of abstraction to get three computers to act as one computer, you added dozens of new points of failure. In the conventional case, yeah, you can now shut one down and people aren't impacted. But there's now a bunch of new ways it can break and take the system down and it is much harder to figure out why.