I am one of those who has criticised the way the stones are laid pointing downhill... I find that it is easy to slide forward especially when small pieces of stone act like ball bearings under your feet. I would rather walk up them than down. However having said that I also recognise something has to be done in badly eroded areas and I do not have anything better to offer in the way of ideas.
Over the years I have seen recommendations to walk single file to stop paths widening too much but this leads to trenches being worn into the ground. I have seen the alternative recommended .. a party should spread itself out over a wide area to prevent heavy wear in one area.
I have also seen suggestion that experienced walkers should walk off piste to save any wear on existing paths.