As to displaying the number of kWh left, I'm all for it. It's similar to displaying the number of gallons left in an ICE instead of displaying the "range" (like what many ICE cars have). BTW, in my experience the "range" display in my 2011 Honda Insight isn't all that accurate either.
I've learned certain driving behaviors that will increase my miles/kWh. If the display included the number of kWh left, it may be a better reminder to adjust my driving behavior as needed, when needed.
Nissan just had a tech look over my LEAF for possible battery capacity loss issues. They provided their "report" to me. I thought the report would include a statement of battery capacity (like, 21 kWh at 100% capacity). But no, their report doesn't even indicate that they checked this. I suspect that Nissan doesn't want LEAF owners to know (or, to easily determine) their car battery's capacity.
But when the LEAF becomes more prevalent at used car outlets, wise LEAF shoppers will need to have a way to verify battery condition, including capacity. It appears that even brand new LEAF's have a wide variance in battery capacity. Right now, it looks like the GID meter is the only tool we have to take this measurement.
I'd like to have see a sticker on each new BEV that states the total battery kWh when the car left the factory.