Yeah, the first 15 or so years of my photography 'career' (read: hobby) was all digital. I know it's silly to some, but probably the most immediate, concrete, and satisfying difference on my switch to film was the manual advance. Above anything else, it's the thing that really hits the cliché "it makes you treat every shot with care" button for me. I have a couple of modern AF film SLRs now, and they sit on the shelf because they feel too much like being back with digital. And I hate the sound of the film advance!
We all have our own personal levels of desired interactivity and 'labor' as far as shooting goes. Maybe manually advancing film is a bridge to far for some, or manually focusing for others. I myself find red-window advance a huge pain in the butt and would really rather avoid cameras that need it. I also don't mind going without a built-in meter for medium format, but in 35mm, for whatever reason, I have much less patience for it.
So yeah, I guess this was an entirely pointless post, but this MC-A really does come soooo close to ticking all the boxes for me. Just stick a better lens in the next one! Or better yet, figure out a way to make an AF version of the 7sii/Auto S3/QL17 cameras that somehow doesn't lose the actual rangefinder!