Edge blending has a MASSIVE use in commercial projection, Lumagen have to date either failed to recognize this market area, Or feel it has no viable product value - While many others specifically target this market.
The all the existing amazing features of Lumagen products and links to 3rd party calibration software for fast automation Lumagen products are possibly already the best foundation for this feature.
Large projection of images on screens for presentation benefit from the high resolution and close projection to screen distance allowing staggering images on large stage production with relatively small total kit size and weight, Important for logistics costs both shipping and on site labor.
This took a step forward with 'close projection' projectors which could be inches away from projection screen, still requiring 'blending' for that high impact large screen image.
One company felt this function so important it was included within the projector 30 years ago, Carried forward from CRT to digital projection.
This feature is not restricted to dual PJ left/right blending, Multi row projection using top/bottom/left/right blending is a requirement.
ONE of the things about blending is that you don't have to consider 4K per output as the target, the beauty of blending is that many lower resolution projection units are combined to create the final image, 4K would actually be WAY BELOW a large number of systems,
PLEASE PASS ON that 'bit depth of the roll off area is VERY important, CRT requires high bit depth in the roll off area to avoid obvious visual stepping' - I worked with another company many years ago after I highlighted this issue to them, Digital did not have the infinite color ability so this was not so critical at the time, Technology moved forward so still a high priority requirement.
Early (SEMU) information is worth a read with the way they alter roll off based on intensity, and day/night light settings - IIRC.
Imagine walking into a Cinema, Museum, Concert, Office corridor, Car showroom, Nursery, School, Airport to see a long wall 'alive' with a seamless image projection....................I give you "Lumiblend".............