No Charlie, Your analysis above is not entirely correct.
At least one third of the States in the US already have adopted into law the ANSI 117.1A Standards for ADA. ANSI 117.1A requires dome-shaped rounded Braille dots. If you are in a state with ANSI 117.1A standards (such as here in Minnesota) then Dome-shaped Braille is the law. This will soon be the case in all states, now that the DOJ has put it's stamp of approval on the standards. Visually-impaired people want dome-shaped Braille because it is easier to read and does not cut their fingers.
Dome-shaped Braille can be made with our Raster Braille process, but it can also be made with the routed-out Braille process is special dome cutters are employed. We have photopolymer manufacturers using Raster Braille in the photopolymer materials also.
I would disagree with your implication that Raster Braille is an "expensive proprietary process". The complete Raster kit is $1995.00 and most shops recoup that entire investment with the very first large ADA job they make with Raster equipment.
Shevy