Ray, I did not say, “I also don't understand why you keep insisting that bugger all users would want such an EVF and that such an EVF would ostensibly be unusable”. I only said it was not an EVF that everyone would want, as you had implied. If you want a small EVF, fine go get one. I was just pointing out the current small EVFs that you have referred to, had to depend on additional processors built into the cameras that use them. If BM or someone else can delvleop and market a small EVF under $900, then great.
I bought a 3" Hoodman loupe for my early mirrorless cameras ,before EVFs became available, and it's bloody awful. I decided then and there not to buy another mirrorless camera until EVFs became available.
I came to the same conclusion after using the Zacuto ProFinder which has better optics than the Hoodman, put it on the original Pocket camera, with its low res screen, it was not easy to use either. So without a good useable EVF, I passed on the new Pocket 4K, and canceled my pre order because I could see adding an external EVF from what was available was a non starter, without getting overly complicated or too expensive.
I picked up one of the new Nikon Z6 Cameras I stead, it has an excellent EVF that got very good reviews. That said, it is one of the best in camera EVFs I have tried, but as good as it is, I do not see trying to use it more than for a few minutes, not an EVF I would want to try and use for a long video take. Same goes for the EVF on my Olympus PenF. But that is just me and how I use an EVF for shooting video. For still photos these two EVFs are great. And this is a wrap.
Goodnight.
Note: edits to correct typos only