Please visit the Community link above where this is discussed in great detail. Believe me, I strongly believe in the important role of OSM to be the best pedestrian (and other) router and expended a lot of effort to ensure that the tagging reflected the situation on the ground, and also reflected the availability of accessibility features. The only dispute is whether inconsistently adding little lines on the map alongside every road improves or worsens the ability to compute pedestrian routes.