Don't forget that in Shadowrun, "the old ways" might have benefits to them magically. It's easier for an Adept to Attune with something less technologically advanced, for instance, or for a Mage to use Analyze Device. I'd say it's more in keeping with some magical Traditions to have an old-style, hand-made, weapon for a Focus than for it to be an all polymer, laser-etched, yadda yadda yadda high tech folding knife.
It all comes down to flavor...but in a world with magic, sometimes that "flavor" can be pretty strong.