Conventional landing analysis considers
(a) approach (air) distance
(b) flare distance
(c) ground distance
with a bit of jiggery-pokery to join them all together.
(a) steeper approach might reduce the steady air distance, but increases the workload and judgement required for the flare. In addition, for normal jet speeds, the ROD will increase ... and we really are getting up to the point where a mishandled flare will cause a landing impact exceeding the drop test loading.
(b) the steeper the approach, the more skill is required for the flare - unless a carrier landing be the call ... see drop test loading. While I have no experience of steep approach angles, I would guess that the flare skill required is moderately high to achieve any sort of reliable repeatability ?
(c) for the same presumed touchdown speed, there ought not to be any sensible difference in ground roll for maximum energy stopping conditions .. and, if the speed spread is significant, the AFM data is going to suffer and we would have to wonder what the point of the exercise was ... ?