I'm in the process right now of making enlargements from overexposed and overdeveloped 50+ year old 35mm negatives. This level of intensity would be a huge help. I'm struggling somewhat with lengthy exposure times for full-frame magnifications on 8x10. These negatives are opaque. I've had to go back to a high-intensity single-tube V54 head and use Ilford under-the-lens filtration for the worst offenders.
Do you have any data regarding effective intensity levels for the low contrast end? Grades 0 and 1? As we've already discussed, there seems to be about a 10x natural exposure time spread between the highest and lowest contrast levels. And my overdeveloped negatives are also very high in contrast, thus requiring those lower filtration levels.
Also as we've discussed, my preference would be for a unit that can be integrated directly into my existing enlarging set-up and workflow. I would prefer to continue using the Zone VI Timer that I've already invested in and grown accustomed to over the years.
The thing about f/stop printers is that I might imagine the bulk of those interested in that approach have probably also already invested in (rather expensive) timing units, and evolved their own workflows around those. My guess is that they may not want to give those up either.