The way I look at it is my feet are my primary form of transport, I'm not taking the risk of disabling myself in the middle of nowhere by not wearing boots.
Reminds me of a chap I used to work with who would only wear his slippers to work in a metal casting machine shop, rather than wear steelys. He came a cropper.
The evidence that boots actually confer an advantage is sketchy. Some research supports it, some doesn't. It's a topic of lots of discussion on ultra-light backpacking boards.
The best pro-boot argument people make is that they prevent ankle injuries. The jury is out on that, in fact. Again, some research supports it, some doesn't because.
And more important there's this: if a boot does prevent the shock to the ankle, it does so by pushing the impact upstream to the knees and spine. Thus you risk tearing an ACL or worse. You can always hobble out with an ankle injury. If you tear and ACL, you're in big trouble indeed.
In other words, bodies entire shock absorbing system -- foot, ankle, knees, spine -- gets short circuited by boots and the knees and the spine have to take it all.
Mind you, I'm not saying that boots are worthless. But their worth isn't as certain as people think.
However, there is no dispute about this: the best way to prevent all backcountry injuries is by reducing your carried weight.
Earlier someone posted a question about carrying a 50kg pack -- and that's an invitation to all kinds of injuries, boots or not.
Other than when hunting and carrying out a kill, I don't carry those kinds of weights -- my typical pack for a week out is about 11 kg, (slightly heavier in the dead of winter).