While in theory wooden practice weapons are wielded just like the weapon they're meant to represent -- whether we're talking bokken for Kendo, or rattan sticks for Kali/Escrima guys -- in practice I'm sure there are enough differences that they're at least as different as going from a machine pistol to an SMG, or from an assault rifle to a squad automatic (LMG). In real life, lots of times these things are almost exactly alike, but they're different enough that, for game balance and combat skills in particular, a new skill is needed.
For instance, when you jab someone with a bokken, you're going to give them a bruise. If you do the same little jab with live steel, suddenly maybe you've got to figure out out to get your sword back out because now it's stuck in someone's belly instead of just knocking the breath out of them. Going through a Sinawali routine with a pair of rattan sticks in the Filipino Martial Arts, you're practicing for speed, footwork, balance, rhythm, and accuracy. Do the same Heaven Six Sinawali with a pair of machete, though, and suddenly you've got to worry about blade facing (making sure you're swinging edge-forward), differences in weight/balance, and -- oh yeah -- if you were to actually perform the combo on someone's head, suddenly instead of thwacking your sticks against your buddy's in practice, you've got to tug your machete out of someone's skull.