I kind of find those comment about the focusing a matter of user unwilling to adopt different approach, how hard can it be to focus on a ground glass. Its a groundglass, just like your focusing screen on your 35mm or 645/6X6. Ok admittingly its reversed and dimmer, but then its also much larger and you are looking at the actual image that are to be recorded. We compose and focus on our subject, check the background, check the frame, check the DOF. That is just the same in a technical camera / 612 or 4X5 or what. If one can focus on a 35mm SLR or so, one can focus on a technical camera, just that the steps taken require different approach to the control ( so you twist the lens on your 35mm, but you need to adjust the bellow draw on a 4X5, youj check DOF using stop down button, but simply stop down the lens aperture lever on a field camera ...
) - I think most user had this notion simply because they failed to adopt a stance that using different system require different technique and different approach ( and frequently they do not learn the pitfall befor even trying one ). In fact if I were to be for real wanting real Panorama. I would look no further than getting a true 4X10 ( in case you wonder, this is the starting size for large format Panorama, others are 7X17, 8X20 )
goto your area public librarfy and enter into the computer catalog "Large Format" and you will see plenty of books on this subjects like the usual "Large Format Basics" & "Large Format Techniques" and some others.
And No, it did not take thousands of roll to get to focus properly with a 612, unless you only always guesstimate I suppose. Well I teach Clifford how to properly get the 120 back to work on his Linhof on the first try anyway. Its just a matter of learnign the basics and doing it one step at a time