I've lived with to the PS4 exclusives without complaining up until now. Reusing story missions for strikes is okay, I guess, but when you get an expansion that promises new strikes but doesn't offer the real new one to everyone is just wrong.
I believe if you want console exclusives offer them as "bonus content" and offer a paid "bonus key" to unlock the content on other consoles earlier. For my part, I would have paid $10 for a content key each time. That's $30 of extra income that could be earned on top of your PS4 money from Sony.
Waiting a year to access this content is just ludicrously frustrating.
You do realise Sony paid for the exclusivity along with their relationship with Bungie (they helped design the ds4).
If you wanna get mad at someone, blame MS for shafting them.