Tradition is forward thinking as well.
I will use a couple of examples to show this. The Assumption that that Tradition means you are locked into something is in correct.
Jow Ga Kung Fu - Was created by blending techniques from 3 different traditional fighting systems. If Tradition means that someone is "locked into a system" then it would be impossible for Jow Ga Kung Fu to be created. By your definition Hung ga, Choy Ga, and Northern Shaolin should be "locked" and not blended.
Here are some other traditions that are forward looking Christmas, Thanksgiving, and Halloween. People are always finding new ways to celebrate these traditions. Mardi Gras and 4th of July are also traditions. These traditions have also changed over the years. For some Super Bowl Sunday is a tradition.
Traditional Bo hunting's evolution. Why hunt with a bow when you can hunt with a gun?
Traditional Auto racing Nascar
Baseball is a traditional sport, same as basketball.
All these things are traditional, but they are not "locked" as you suggest. If Traditional means that someone is locked into a system, then there would never be different types of Kung fu systems out there or different types of Karate systems out there.
I don't think Bruce Lee really understood martial arts as much as we give him credit for. I think much of his take on Martial Arts was based on his Chinese culture and that more than anything was his real beef. People hold Bruce Lee up as if his wisdom about Martial Arts was something new.
Jow Ga Kung Fu was created in 1910 and blended different fighting systems. The founder took what he liked from 3 systems and blended it together to create a new Hybrid fighting system. Like many other martial artists of his time, he studied more than one martial art system. This was long before Bruce Lee was born, and the Founder of Jow Ga was not the first person to blend different martial arts system.
So when people start talking about "Bruce Lee" Wisdom, there were a lot of Traditional Martial Artists out that combined other systems into their own and in some cases, created brand new systems.
I think Bruce Lee's problem was simply that he didn't like how Wing Chun was doing things, and he didn't like Traditional Chinese Culture and he thought that was out of date. If anything, I bet his desire to learn from other systems came from a forward thinking Traditional Martial Artist. Since many of those traditional Martial Artist would have studied more than one more martial arts.
Similar to how many Traditional Martial Arts on Martial Talk have studied more than one Martial art. That seems very forward thinking to me.