In the real world it does adversely affect many people, which is why the subject has attracted the attention of the Transport select committee, who seem inclined to do something about it.
Agreed, it affects a great many people, to differing degrees, depending upon their personal circumstances and location.
It receives very little attention because, 'well what's the point in reporting it, nothing will be done'. Further, the people making the decisions on regulation / levels of enforcement are generally going to be guilty of the same bad habits, 'there but for the grace of god go I'.
Stepping around a single badly parked car on a residential cul-de-sac is different than doing so on a busy road. Doing so a hundred times over a decent length walk increases the risk considerably. YES people do walk as a means of transport, not just round the corner!
Stepping around a single badly parked car for a fully sighted, fully mobile person is a rather different experience to that faced by a registered blind person, or a wheelchair user, or a pushchair pusher, or a mobility impaired person. When a person 'just pops their car onto the pavement' do they really think who is likely to be going past whilst their car is there?
I remain of the view that a large number of motorists simply 'pop it on the pavement' out of ingrained habit. No thought process beyond that at all. The evidence is my own experience on a daily basis.