This shouldn't have a negative impact on the premium-cabin experience at all. In fact, this could be the start of a new worldwide industry trend. I hear EK is now considering opening up the F shower suites to Y pax to reduce crowding in the Y lavs.
As someone who has flown a lot of times in transoceanic Y worldwide and transcontinental Y within the USA; on full flights, I always enjoyed the privilege of not waiting 15-20 minutes for the lavatory at the galley before landing and just after pre-arrival meals are collected.
I can't speak of EK as I didn't fly them after the pandemic has started although, on one of my flights on QR, the crew was very succesful sending people back to the Y lavs when they attempted to rush front from the curtain. I was seated in the bulkhead row in Y and there were almost 20 people who attempted that.