To some, it isn't acceptable
Believe it or not, there are light snobs!
The Diamond lights point straight down with their diffusers or whatever those are called.
This creates a different shadow on object balls near either end rail than do the standard type of lights. I've watched many a player cut too thin on these shots under Diamond lights.
Maybe my judgment isn't correct here, but I have problems with these shots, too, and must take an extra second or two when under Diamond lights.
I'd think a shorter version on a longer table would make that problem greater, but not sure about that.
My opinion from subjective observations, so take it as such.
Jeff Livingston