Huh, kinda gives no purpose to final position which works on a surface layer with no coordinates (let's say after compute normal for lateral displacement and offsets with all data coming from.the child.) Bit confused still. I also havebt had this issue in the past and never had a input into distribution and was able to get minmums just fine.
When I get home ill post the first island with minimum distribution, the tgd had no input as it was designed last year.
Edit: Well apparently my external HDD fell behind the desk and is now seized and I have none of my projects/objects from the past backed up. Ugh.
I do know I have never once used the input on a distribution shader though and have done plenty of beach scenes, sadly I always give up cause I can't make good waves.