The problem with digital film emulation is:
1-It emulates the look of scanned film, not darkroom printed. And scanned film has no grain, it has aliasing due to the scanning device; this aliasing can be quite different to a wet print and, unfortunately, prints don't scan well.
2-There is NO and absolutely NO such thing as Tri-X "grain", silver fx and all are missing the boat. There is Tri-X in Rodinal, and Tri-x in D76, Tri-x in D76 1+1 at 20o or at 24o, with a lot of agitation or not, and on and on and on.
3-In color, it gets even more complicated as computers have a very very very limited color gamut. Shoot red dominant subjects with slide film, then with digital... you will see the difference. Again, the problem is that if you scan slides you end up with pretty much the same limitations as shooting directly in digital.
Digital is good at what it does best, and it is surely not look like film.
Take digital for what it is, it has a lot of qualities, but those are surely quite different.
K