With full authority digital engine controls there is just no need to have separate throttles when a single thrust lever will do the job. Helicopter folk will probably be wondering why so many twin engined FW aircraft don't have a single thrust lever.
The design on Rafale enabled a more ergonomic thrust lever as it does not need to be split for each engine. For me it felt very easy to use and much more natural, although I have always wondered if the cramped cockpit drove the need for the design as it is really tiny in there - especially compared to the roomy office in the Typhoon / Tornado / Harrier II / F-35. The odd 'what-the-butler-saw' console also exacerbates the claustrophobic feeling.
That said, it is one of the most comfy cockpits I have been in and whilst a bit wacky the cockpit does work rather well.