Whoa, dude! It's been around for maybe 25 years in Word. I know it can be tough keeping up with the rapid change of pace in computer software. ;>)
And, if you accidentally type in all lower case, you can just as easily change to SHOUTING CASE with a click.
Does it work with passwords? I just pull the damn key out on every keyboard I use, seriously.
With a properly complex key sequence required to initiate caps lock, a "convert to lower case" utility would be needed MUCH less often. Caps lock is too easy to hit by mistake.
"Dude"? Good lord.
We don't all use Microsoft Word, dude. Also, we don't all want to waste our time using a "convert to lower case" utility in ANY word processor to fix mistakenly capitalized text that would never have been accidentally capitalized without the miserable caps lock key on the keyboard.