My Vitessa L is a PITA to load, or perhaps I haven't learned how to swear properly in German. Between not dropping the removeable back - what sort of idiot idea is that? - resetting the film counter on the front of the body, and sliding the back on without snagging the film somehow, I can spend several "happy" minutes admiring the camera's superb fit and finish. But once loaded the camera is a marvel.
My easiest camera to load? Probably my ancient Praktica LTL. Hinged back, put the cassette in its well, extend the film tongue under a little protrusion near the sprocket and up to a dot. Wind the film, a bent wire bail catches the film and you're ready to go. For hand loaded film, no real need to trim a tongue as the wire bail will catch a crude diagonal cut. A wonderful system. Fit and finish of the camera? Only as much as needed, but it is one tough customer. Still working after maybe 40 years of hard use, bouncing off the sidewalk, and no servicing.
Two diverse examples of German engineering.