In reply to SteveB_NWUK_99:
From my point of view, to see the value of these slabs you only have to look at Black Hill and the area around the trig point there. It's not just that the paving of the Pennine Way there has stopped erosion, it's also allowed the flora and fauna of the moors to repopulate the area. The before and after photos speak volumes for the work Moors for the Future can achieve.
And, of course, old though they are in relation to us, a lot of the moors in the UK are man-made in origin because of deforestation in prehistoric times - and a lot of them are "managed" by the grouse-shooting industry, wild though they may look. I can see where you're coming from with the spacing of the slabs but I think once they've "grown in" the visual impact will lessen. And speaking as someone with short legs, I'd probably find the gaps hard work on a hike!
I think Brown Knoll is already showing signs of improvement in terms of biodiversity. We live nearby and went up there for a few evening walks over the summer and it was beautiful to see some of the groughs showing new growth in grasses and mosses. It was also beautiful not to wade through knee-deep peat too! :-D
When I was walking up Ingleborough a few years ago, someone had scratched into the newly-laid slabs "Stop Paving Our Mountains". When I was walking down by a different route, the eroded and unpaved path had sunk a couple of feet below ground level in places. There was nothing natural about that ugly scar in the landscape either and I know which one I preferred.