As one who has shot MF for quite some time, and tried a tech camera for about a year, I have some personal thoughts that apply to me ...
For me there is no doubt if you have great technique and know what you are doing, technical quality of the tech camera and lenses will be superior, especially when you pixel peep. Obviously subject matter will dictate how important that difference is. Another factor which I feel is important is how large prints will be and how much will the difference show through on final prints. Yes, I think the tech camera can be superior, but won't always be.
To me it wasn't about the quality of the images ... while the tech camera has an edge, I think printed they both are very good. To me it was about the images I missed because of the workflow. Had I been more experienced with this type of shooting my feelings might be different. There are occasions where the workflow of a tech camera is no problem, but in my case I just don't work that way. Most of the time when I shoot it's a location I'm only going to get to once, I've scouted multiple spots and compositions, and I want to get them all.
I also started with a p65+ back and the Schneider 35 and 47 were pretty good, but the the IQ180 I felt the LCC just had to work too hard, and that means giving up 2 stops or more of my dynamic range to make up for the fall off. The color cast was so extreme I also was uncomfortable with how much manipulation it required to neutralize the color, and I also felt that using the LCC eliminated the "natural" fall off in density of a wide angle lenses and left the outside too light, requiring every image to be "fixed" with adding vignette (so more manipulation). One of the main things I like about MF is the amazing dynamic range. With the DF I don't lose that.
I'm interested in getting back into a tech camera (or even something like a Lihnhof 679) someday, but only if I can pick up a decent used system with a few lenses. If I went tech, I would probably go Arca because the tilt is one of the biggest advantages to get sharp images. I also would probably only go with retro focus lenses (like the rodenstock) to reduce some of the color cast and fall off. This would be a nice kit when I'm headed to a location where I've shot before and I'm really trying to nail a single composition or two.
The DF gets a lot of knocks, but to be honest, it has everything I need, OK AF (and I can focus it manually quite well), I only shoot in manual mode and can nail exposure easily. What it's missing is good exposure bracketing, so I have to do that manually but don't find a need for it too often. I'm also from the Zoom lens world and my copy of the 75-150 is very sharp and my favorite lens, although the 55LS is pretty sweet.
Not knocking anyone else's position ... that's just my own personal experience.