A tempered glass screen protector isn't going to stop thousands of kids from dropping the thing to the floor and shattering a $300 device to peices. You're a moron if you think a piece of glass will stop that.
Wurkfur, if you let your kids run around with your $300 electronics devices I'd suggest it's you that's the moron.
I have a simple, ingenious solution for this, I have my Switch, my kids have a second hand DS that I paid $20 for on Ebay. Problem solved!
My phone has a protective rubber case around it. Nintendo's design disallows people from using anything like this because of the way the controllers connect and also the necessity to dock in the bottom.
Meet the officially licensed Nintendo Switch case by PowerA:
and the 3rd party Nintendo Switch case by Orzly
You're telling me that nobody should allow the biggest audience of the NINTENDO Switch (kids) to use the Switch? Are you serious? Wow. Also the cases you listed can NOT be used with the dock. You have to remove the case to dock it. It was a bit of an oversight on Nintendo's part to not bother putting any thought into this.