Small potatoes. Flextronics has the AX, AXi. That's 2 models out of hundreds of high end. CWT has a few, even Andyson has 1 or 2, Chicony, Delta, Greatwall etc all have a couple. But the vast majority are a combination of Seasonic or SuperFlower based platforms.
It was 'the grass is green' statement, obviously grass can also be blue, yellow, brown or a variety of other colors, but generally grass is considered green.
For the last 40 odd years, concerning psus there was only 2 real choices. Seasonic or junk. It's only been in the last 10-15 years or so that there was any other choices. And that's only because nobody really gave any real thought to the psu. Only stipulation was wattage size. Things are far different now. There's a reason why Seasonic was/is the 'go to' psu.