I have been using Arca-Swiss F69 with P45 since early June. As I have reported in other thread (Focusing Arca F69 with Digital Back, Ground Glass and Fresnel lens combo), I had initial problems of focusing with the factory provided 'fresnel + ground glass.'
However, I have been 110% happy with my setup since I got the ground glass from Maxwell Precision Optics, it provides very bright and tack sharp focusing. I am using 10x loupe for focusing and do not use a dark cloth anymore. I found the screen very evenly and brightly lit for composing and focusing with Schneider Digitar 47, 90 and 210 mm. However, I have to shade the screen with my hands and properly align my eyes when I use 35 mm. I cannot focus any better even in tethered mode to my laptop. It is absolutely unnecessary to have my DB tethered for focusing purpose.
I am not using a sliding or sliding/stiching back in my setup, so I have an extra step (composing and focusing, then remove the ground glass and mount the DB) but I wouldn't call it either 'hard or tenuous.' Obviously, a view camera setup is bulkier than specialty cameras, such as Cambo Wide or Alpha Swiss, but you have the flexibility of full camera movements. Schneider Digitar lenses; 35, 47, 90 and 210 mm, have the image circle diameters (at f=11) of 90, 113, 90, and 120 mm, respectively. That means each lens can shift 17, 29, 17, 33 mm for P45 (37x49 mm sensor) in horizontal mode, 19, 32, 19, 36 for vertical mode. Arca-Swiss has +/- 30 mm movement in both verical and horizontal direction.
I cannot comment on Architectural application but for for landscape, it is hard to beat the combination of a view camera and a DB . However, the portability is an issue one has to consider since one has to haul it around. My present setup is 'fully assembled vew camera' in a home made box that I carry in a light weight nylon backpack (just under 10#) for hiking or put the box inside Lowepro Phototrekker AW for air travel. The box includes the fully assembled (on a folded rail) with a lens, DB, GG, and cleaning brush/cloth so I can take the camera out and mounted on the tripod in a snap. I carry extra lenses, a light meter and filters in my field jacket, and carry my tripod on shoulder when I hike.