Left and right hand engines rotated the same way, they need airflow coming in at the optimum angle, which could have been facilitated in one intake, but not so in the other, hence the fences to present the airflow at a better angle (but with some energy losses).
We did not learn in 2 generations of aircraft that you need a convergent-divergent nozzle on a fighter jet's engines to work well at altitude. Think Spey Phantom vs J79 Phantom. RB199 vs anything. Not worth it if you stick to low level, the weight and complexity will not pay off vs the marginal advantage, but as soon as you switch from Norfolk Land Shark to fighter mode, con-di nozzle is the way.