IMHO, a knife is a tool, just as there are specific tools to accomplish specific tasks, likewise with knives. Yes, you can often use an alternative tool to complete a task, but often the task is accomplished with greater ease if the tool is designed for that function. Knives come in all kinds of blade and handle designs, materials, lengthens, etc. most are either uniquely designed for a specific task or a compromise to accomplish a series of tasks. Using a wood chisel to open a can of pant may work, but in the process, may inflict serious damage to the tool. Likewise using a pry bar to chisel out a wood joint is possible, but the effort and results maybe less then desirable.

Selecting a knife is much like others things in life, a matter of personal choice, and a compromise over carrying several knives for various tasks. What one becomes comfortable with is often a matter of knowledge, training and practice.

Controlled experimentation and practice (especially not during an actual survival situation) are vital and critical efforts for the decision making process. Doing so, allows one to make appropriate choices in selecting tools and skills.

Pete