There should be a slot on the back to slide old blades into

So define Operating System. Are embedded systems Operating Systems? Coz that’s going to cast a rather wide net.

Anything marine or aeronautical

Google throws a heap of apps and ideas at a wall to see what sticks. Then it periodically hoses down the wall. Never come to rely on a google app or service. It’ll be hosed off eventually.

Completely skipped the voice control which is the part I use the most.

Computer.