Phottix also allows 2nd curtain sync off camera, which the Canon 600's cannot. Can someone explain how a 3rd party company can make a flash that can do that on a Canon camera, but Canon can't? ??
I expect to see second curtain and wireless zoom in the next generation of Canon flashes.
I don't, if they were going to introduce those as features then they would have done it with the introduction of the RT system. They chose to go five groups instead of three ( much more useful to me), and built in tranceivers, an industry first.
As for the question " How can a third party introduce a feature the original manufacturer can't?" Well that isn't too difficult, Canon have to commit to full implimentation across all EOS bodies, third parties do not, Canon have to make things work 100% of the time, third parties do not, the people paying the Canon premium expect consistency and reliability, the people buying third party gear are very accepting of compatibility, reliability and consistency "issues".
If Canon can't introduce a feature they feel they can stand behind 100% now and in the future then the bean counters and lawyers won't let them release it. The third parties don't care about the camera system as a whole and really don't care if none of their gear works with next years cameras.