Thank you for the reply! I upgraded SF and the problem with the fresnel being too strong was fixed. As for the seams in the cubemap i changed the multiply from 7 to 4-5 and the seams went away in rough materials but appeared in smooth materials, so i put a clamp 0-1 node after it and the seams went away with the multiply…
I'd say: 1) Extra emphasis on each and every compatible package you're going to keep support with. 2) As Bug said, grant support for as much time as you can 3) Stress the fact you can build shaders without actually typing any code. 4) Maybe provide a very basic package of the most common or creative materials you can…