I do not require agreement. My experiences working as a commercial fireworks shooter, limited as it was, tells me all I need to know to understand the need and use of mechanical switches. I have no need for any additional EE theory or statistical data. I know the difference when someone is pi$$&#@ on my leg and when it's raining...It doesn't appear the Navy would agree with you.
"Unlike most other electrical parts, switches contain mechanical elements and are therefore subject to failure mechanisms associated with mechanical wear of the switching elements."
"Except for special high voltage and high temperature applications, solid-state switches are inherently more reliable and predictable for long life applications."