Since you are cool with judgement, I'll just point out that photographers have been putting neutral density filters on cameras since long before you were born.

People used to make the same arguments about introducing artificial light. So overdone!

And? The problem is. Someone started shooting running water like this, then the amateurs copied it, and now you can't see a damn waterfall that doesn't have this overused, repulsive look. It's ugly. Just like people can't make a Moon shot that is not a full moon, whyy?

You should launch a site where people can list the things that they've done so that everyone can see a list of things that are Done, knowing that if they try it, they will be embarrassing themselves.

Trying to replicate something that already exists, without adding anything unique to the mix? You mean copying? Then showing it as yours? Does that create any value? Where does that even lead?

I mean if you recreate it in order to learn the technique, that's good.

It's like in the bbc show where they were sawing logs in front of an orangutan and the orangutan copied the action, but didn't really know why.

To be clear I don't have any problems with this photographer's work, just remarked that each and every waterfall looks the same on Flickr.