The worst I've had was being woke up by a bear sniffing the back of my head.
I mean, you break and arm or a leg or get a bad cut, you will use clothing and sticks to, (or hiking poles) to make a splint, or clothing to stop the bleeding.
I have done most of the JMT without a sleeping bag as well as the entire TRT without one.
There are enough people on most trails that if you are really going to get into some serious trouble, then you are going to need the help from someone anyway. You'll never be alone on the side of the trail until someone comes looking for and finds you. When you're moving good and eating enough calories your body keeps you warm enough to want to be in shorts and a short sleeve shirt all the way down to about 35 degrees. So you just get some sleep before and after the sun goes down or up and there is no need for a sleeping bag.
I actually made an 18 ounce bag to use now, but this is only so I can take about 18 ounces less clothing. Just a long sleeve shirt and a wind breaker. If it's cool enough to wear a long sleeve shirt then I can just bring a wind breaker. I used to bring warm bottoms and a warmer jacket with the shirt and wind breaker.
You read many trip reports where people are pushing good milage and they will say next time they won't bring a bag.
So why do you really need to take everything you have in a bathroom that just sits there and you may use some of it twice a year? That's about how often I really need to use a knife other food preparation.
I just bring what I have to have, not what I may or think I need.