cjg1941,
Your question is one reason that double bladed knives became popular.The other reason is that more than one blade allows for different blade shapes, hence different purposes.
And yes, I do 'save' a blade. Before I discovered one handed knives I always carried a double bladed slip joint and kept one blade pristine..I even have a custom with one blade labeled 'bean' and the other labeled 'super'.
Both blades are 440C, the bean is Rc 57-58 and the super is Rc 60-61, two clip blades using opposite ends of the same spring, all set into solid stainless scales (440C also). Eight pieces of steel total (including the pins).
It's an old family joke...the bean blade is to open cans...because you forgot the opener.

The super is for shaving (if you feel like it), it's is super sharp.
These days I carry two knives to work in my shipping department, a classic Sebenza and another knife. The Sebenza does all the hard work...because it can.
My second knife varies, but usually has a couple things in common with the classic Sebenza...metal scales and stainless steel. Whether it's a BM 940, a Camillus EDC or even a CRKT Mirage, I keep them very sharp..just in case.
PS.. I never even bothered to sharpen the so called "knife" on my Leatherman, I don't consider it a knife.
Does this answer your question Lavan?
Steve-O