Almost all functions come at a price. Start with a bar of steel, harden it, grind it (or visa versa), drill it, make it fold into a handle...sure it's weaker but you just formed a pocket knife. Almost everyone would say the advantages in this situation outweigh the negatives, at least for the purpose the tool was designed to perform.
Spyderco seems to engineer their produces nicely for the average customer. In fact, they tend to treat their steel a bit harder and grind their edges a bit thinner (per classification). They walk a pretty fine line between durability and performance. If you want a pry bar I would use something else though...like a pry bar .