I agree, I knife is a tool and is to be used as such. I wish I knew the answer as to why people get super uptight about only using a knife to cut. My guess is they put some sort of intrinsic value on the knifes they own and strive to protect them from breaking.
I abuse the hell out of my knives, some perform better then others but
nothing has failed. Heck I even battoned through small pieces of wood with a SOG Flash to prove I could, never failed and its still in service 3 years later.
Say if I break a knife every 3 years (again, I have yet to break anything), and I acquire say 3 blades a year thats 17 broken blades on my deathbed and 133 knifes my kids will have to throw away.

If you want to carry around a knife and a multi-tool thats fine, but the space in my pocket is worth more then 40-60 dollars ever 3 years. Also who's to say the multi-tool won't break?
Just my 2 cents.