I've explained poorly then. The issue is there's a 4mm gap between the top of the steerer and the top of the spacer.
Does that make sense?
Edit: the 5mm spacer above the stem*
Yes, 1.5mm of steerer poking out of the top of the stem is enough. I target 2.0mm just because that's what my caps are designed for, but you're already into the region of rapidly diminishing returns after you're past 1mm
I've explained poorly then. The issue is there's a 4mm gap between the top of the steerer and the top of the spacer.
Does that make sense?
Edit: the 5mm spacer above the stem*