Before, when you bought $3k Cisco router you got the box that will run indefinitely as long as it has power in about any environment you can go to install it; with or without fans, it had more important business than to give a shit about such things.
Now, when you buy $500k Cisco box you get a over-engineered chassis with 5 separate fan modules with their own firmwares, self tests, watchdog timers and shitload of bugs. It's a fucking fan, it should spin, not do quantum chromodynamic simulations.

Pic related.

Next rant could probably be how Cisco's switch from monolithic to modular linux arhitecture (in order to reduce downtime) turned into having time bombs just waiting to do some crazy shit.