So it's basically a visual thing.. ?
As in other golf sims, this can be the hardest thing to replicate constantly. Whilst a few images used here already show similar shots, their resulting stop vary. However, if I'm reading right, you seek the visual improvement on how the ball 'came to be'.. ?
Or another example ; You would effectively be happy with 2 balls actually ending up in the same position, providing they travelled different paths to get there..?
Anything else may surely impact gameplay..
Hm...If 2 balls were to end up in the same postion after travelling different paths to get there, yes, I would accept it, if it happened... an isolated few times, but certainly not regularly - and as a result of fuzzy quirks that accidentally cancel themselves out. Anything else will impact gameplay, absolutely - at least the "outcome" part of gameplay and not the "seeting up and playing your shot"-part - but to such a small and unpredictable degree that it is impossible to know in advance and that you will plan and play your shots exactly the same as if it weren't there. I will, of course, play a non-fuzzy physics game with delight as well - and just wanted to point out that there was a vital element missing from the equation so far: Uncertainty.
The choice of the word "cosmetic" may have been misleading. Cosmetic as in "affecting the appearance, but not the substance" was not meant to imply a strictly visual change. I do believe that the substance of any shot should not be a completely identical ending for two or more identical shots, but a small radius of a few inches or feet.
There is no way in heaven or hell that you can fire any golf shot IRL and pin the substance of your shot down to a perfect point in the far distance, before the ball stops. Yes, you will imagine that point while setting up your shot, as an aid to yourself, and it will guide your strategy. But if your ball ends up a foot and four inches away from that spot, after hitting a magnificently perfect shot, you will think to yourself: "Wow, what a great shot!" and not: "Aw crap, now that was totally unfair!".
I'm not at all proposing to steal players rewards for a good shot with this, or to turn a golf sim into a pinball machine. Personally, I would be willing to accept a lot of erratic bounces and wobbly rolls and stray angles in a golf sim, because that's how I remember my own IRL golf games. It all comes down to our visions and beliefs about the game in particular and life in general. And mine are that pure, mathematical perfection is intrinsically inhuman and unnatural. And that the nearest we may ever come to any kind of perfection... is through acceptance of imperfection.