Because I've just taken my DF in his wheelchair to a large hospital with pre-covid-designed paths (not wide enough for social distancing) and played 'dance from side to side' repeatedley all the way down the pavement and into the hospital corridors as nobody seems to know which side to walk - even the HCPs. Ditto the corridors in said hospital. Ditto most places without explicit instrucions in stickers on the floor.
Given that when walking on a road you shoudl walk on the right hand side so as to be able to see traffic coming towards you (although you probably only know this if you live in an area with narrow roads without pavements) - Perhaps we should walk on the right on a path, corridor or pavement? Or are there other factors to consider?
Why don't we have a convention yet/ever?