I'm in school to become an EMT, then enroll into paramedic school. I just like having the option on my knives. I understand that swinging an arm into a window is less than ideal, which is why I've got a auto-punch on my shears pouch. '
I've got three rules I try to follow:
1: Always be prepared.
This not only entails some basic equipment, but mainly follows the mindset and knowledge.
2: Always have a backup.
Again, not only just basic equipment. eg, a flashlight, and maybe a lighter, or your cellphone's flash, but always the mindset. Always sort of having the mental capacity to think "what can I substitute this with"
3. Always know where you are going
Not just the ability to point where North is. But to think in a linear fashion "Okay, after this, I go here. After that, I go there"
If my leatherman can punch out a window, then I'd be set for not having one on my Microtech or substituting an Umnum for Sebenza. But until I get a spare window to try on....