I don't understand what you mean by optical-pulse set of facilities. If you have three 622 you wouldn't use Canon's RT at all, you'd just use the Yongnuo.
Exactly my point. The 622's will control the 600EX and the 580EX, no need to use Canon's RT at all. Love the 622s, they're cheap, feature-rich, and work very well. Saves me from having to sell the 580EX-II and buy another 600EX-RT.
And they work with my 430EX and YN565 in TTL, as well as my two YN manual only flashes. The 600s are great, if you have a whole set of 600s, but there's no flexibility.