With a rm3di I have found the the best way to focus is a combination of things. With the wides, 28 35, you can spend a few hours and figure out the hyper focal distance. I used a parking lot since it allowed me to have a nice set of graduations. Once you have it, you really don't need to worry about focus, unless you are working on a shot where you have a critical element within 5 feet of the camera. In my work, with wides, I rarely have this. Each lens will be different and I found the 28 Rodenstock to have the best hyper focal, about 11 feet to infinity at F8. The rodenstocks will also do better in the f8 to F5.6 range, whereas the Schneiders seen to like the F8 to F11 range. I am a big note taker and I have found that most of my focus solutions work across multiple landscape scenarios. It's still a much slower process than working with say a DF body and AF lens, but with time it's gets much easier as you start to figure out the process.
Arca gives you a focal card with each lens, this makes it very very easy to dial into the correct focal range. So you always have that option for each lens. You will need some from of distance metering, I use a very simple range finder from "optictechs" and you can find a lot written about the different brands. I did not opt of the Leica due to cost and after working with the rm3di now for over a year, I find I rarely even need to check my focus distance unless I have on the 60mm or 105mm.
As for the cloud module, personally I would not wait on a camera for the cloud to be delivered. The original e module was announced over 2.5 years ago, and it never shipped as far as I know. When making the decision to switch to a tech camera, the issue of focus was one of my biggest issues, but after working with the system, I find it's not as big an issue as I felt. However without a IQ back, where you can do the 100% zoom and get a totally accurate gauge of focus, this would be a different story. The LCD is still very hard to read in normal to bright outdoor light, but I carry a hood for this. If I was still shooting with a P45+, focus would be a totally different story as it's very hard IMO to gauge anything from the LCD of the P45+ and when zoomed into 100%, it's a very cumbersome process to move around the image.
Each of the tech solutions have advantages/disadvantages, if possible it's always best to demo them.