These conventions include those relating to training methods, tactics, attitudes and organisation.
Look at what used to be convention in ultimate, 15 or so years ago:
Once in zone, stay in zone. Stacks are vertical. Be patient against zone O.
Nowadays, these are no longer hard and fast "rules", merely suggestions for beginners.
Here are a few paradigms. I bet a proportion of these will no longer be set-in-stone paradigms, before too long. Maybe teams are experimenting with them right now.
- mark on the open side of your man
- stack upfield
- don't reveal your plays to the opposition
- throw to an open player
- look at your dump on high counts
- defensive plays are decided before you pull