re: Why do they never call traveling?

1 They call traveling often.

2 The refs are focusing on contact fouls a lot more than footwork often, hard to watch for a slap and the feet at the same time especially with the way these guys move today.

3 A lot of the clips you posted were from old games where the NBA didn't enforce carrying nearly as often, so people got away with what looked like traveling as an exaggerated carry that would be called today.

4 A lot of the times if it's mid-game and doesn't really have an impact on a possession, I think they just don't bother because as someone mentioned it would make the game unwatchable.