Wow!
There's some really interesting perspectives on this thread

. As someone who has ridden both inflatables and ram airs, I think I might post my thoughts.
I've ridden lightweight tube kites, Peaks, Hybrids, and Ram Airs, both Freeride and Race on both foils and twin tips. In fact, a couple of seasons ago, I rode a one kite quiver. The Flysurfer Soul 2, 10m. I have two bars an infinity bar with 20m lines and a race bar with 12m lines. I was riding foil in light winds and TT in stronger winds. With this combination, I was able to ride from 6 knots up to 25knots.
Are Ram Air kites difficult to fly? No. However, saying that, if you expect them to fly and behave like an inflatable, then you may find the transition a little bumpy. As with any new tech or product, there is a need to update skills. The problems arise from Inflato riders expecting to just hit the water with a Ram-Air kite and fancying they'll just fly them like they always have before.
If you take the time to thoroughly learn the nuances and specific skills required to get the most out of a ram air kite, you will find they will relaunch in winds even the best inflatable kite could only dream of. You see, the inflatables are fine in the air, but once they fall in the water, they are very difficult to relaunch into air speeds that they will fly in quite happily whilst high in the win window and dry. The difference with a ram air kite, is if it can fly, it can water relaunch. And that right there is the difference between inflatables and ram air kites in low wind.
I could ride at 20 knots on a 21m Race kite in just 5 knots of wind and relaunch it in 5 knots or even less and have done so many times in the river in light wind sessions when the river would sometimes glass off completely to stillness. The ram air will sit on the surface and float without taking on water, so long as you don't pull on any lines trying to launch in wind too light. Simply wait for the slight gust and relaunch.
The cost to buy a ram air kite is cheaper than the cost of an Aluula or lightweight specialty inflatable so there is no cost advantage buying inflatables.
There are definitely kite specific techniques to using the larger higher aspect ram-airs when compared to inflatables, especially on very short lines. I really enjoyed learning the intricacies of getting the most out of a ram air kite, but like many that came before me, I just went at it and learned a lot of lessons the hard way. If I had someone show me a few tricks when I started, it would have been easier and more fun.
It still to this day feels like riding a horse and cart (riding inflatable) compared to the efficiency and power of a quality ram-air kite.
My 2c worth
DM