There is no argument here that root-pruning to accomodate new footpaths (or repairs) is unacceptable. Finding the solution of durable, tree friendly, low end cost, low maintenance , high aesthic alternatives isnt so easy.
Great if you can use raked gravel, or bark mulch, or boardwalks, but many times these are not an option.
Even segmented pavers, or Eco-loc (which are also comparatively costly) require TOO MUCH excavation for sub-base to be considered near mature trees. and there are limitations with soil types and grade (10% max. for Eco-Loc).
Wheelchair accessibility is a big limiting factor to materials choice, as is overall durablility. I have plenty of info on low impact surfacing (see attachment) ... but I've not yet found one which doesnt have a downside IF installed directly near trees.
If rubber sidewalks prove to be inert (or chemically stable) then GREAT ... case-by-case, it could be another option to consider. The ideal world would be to stay out of the root-plate area of trees ...
TD ... that's a very sad story of your Aunt, AND proof that authorities need to make make appropriate and timely respones to the dynamics of trees. Just last night I walk a (concrete) footpath in our local LGA which had been ground down in many places to restore an even walking surface. High cost ...probably, but certainly effective hazard management.
