If an airport cannot accept IFR ILS approaches because they are too busy, then they are too busy !, and something needs to change. Decreasing safety margins at night just to get a large volume of aircraft in, strikes me as a very risky step.
You seem to draw the line (and so does LH perhaps) for
too risky at FMS guided visual approaches with visual separation. Perhaps because that’s uncommon in Europe? What strikes me is that all Americans are in favour of it and all non-Americans against it, roughly speaking. Just an observation. You can draw the line pretty much anywhere you like.