A disclosure, I have an AlterK, that I modified.

That being said, I read in the May 2020 issue of "RaceCar Engineering" the following comment by contributor Mike Blanche,t page 7, that I think is very pertinent to this discussion:

"Generally attempted copies of winning racecars result in them being unsuccessful as designers egos, and the need to justify their positions, mean they try to put their own stamp on the design, which unknowingly screws up the overall package.

Or financial issues cause manufacturing compromises, with a similar effect."

Most would agree AlterK was the first to offer this much copied design solution.