Actually its closer to 90% but thats still not portable, no matter how much you wish to ignore basic IT terminology it does not charge the real meaning of that terminology.
Harware is tougher, but at least the entire company isn't shutdown while we upgrade the hardware, just who ever's hardware is being upgraded that particular minute.
Have you ever worked with redundant web servers, heartbeat failover, or clustering technology?
90% is protable. No matter how much you resort to insults.
Worked with all that and more, doesn't change the fact that centralization of processing centralizes your failure points and makes the problems much bigger when one of those points fails.