That is absolutely NOT true. I have an Iridesse. Its prints fine on linens. Registration is also fine. Do you even have one? I love this press.
Print some heavy solids on linen or embossed stock then print the same on a sheet fed machine. U then tell me which one looks better. Don’t say it’s commercially acceptable so good enough. Iredesse allows for 1 mm back up tolerance and greater then that on long sheet. Many a times they struggled keeping it anywhere near those tolerances. How do you run something back through to spot gloss if it can move a total of 1 mm? Hope you like drop shadows lol.
How do you like printing long sheet gloss with no air feed system? Doubles anyone?