This is correct - how are you going to remove the broken link(s) without a chain tool!?
There was some issues with other brands saying they are not compatible with 11 speed. For me I think it would be ok to push the out the rivet and rejoin with a powerlink etc. It’s only an issue with new rivets as the punch makes the hole on the plates larger.
Chain tools are not specific to brands or number of gears, so you will be fine.
My current tool is bulky and a chain tool is always handy with a link, especially when you’re 50 miles from home. Is it compatible with 11 speed road chains?
The chain splitter is as roobot says to fix a broken chain while out , I’ve broken chains a few times and a quicklink and a little chain tool is the difference between abandoning a ride to push home or get picked up or fixing it and carrying on, some people are so precious on weight (lol)