I don’t think anyone would disagree with you- a ride would clearly be better and everyone’s preference.
France, even with an IP ride, is going to be significantly improved with Ratatouille.
But to say no value added is slightly short-sided. Take Japan, as an example. Still a great pavilion, yet no ride.
Would it be better with Mount Fuji? Of course.
Does it add value without Fuji? Absolutely.
If all you want to do is ride rides, I’d agree. But World Showcase is still incredible and truly unique. It holds Epcot up all on its own.