I think we do need them.
As more and more people return to work and public transport becomes more expensive, we need a safe effective way for people to get to work or school without coming into contact with hoards of people.
I recall at the beginning of the AIDs epidemic when people were crammed jiggling against each other on tube trains, there being calls for TfL to issue free condoms to passengers.
Face masks just won't do it on public transport. We need fewer people on our trains and busses, leaving safe space for those who do need to use public transport. Electric scooters are a cheap and effective way to travel around our towns and cities. I agree they should be confined to roads and cycleways, and speed limited. So what we need is safe roads and cycleways suitable for all. Confine motor vehicles to A and B roads, and in towns prevent through traffic for larger motor traffic on unclassified residential streets, while allowing free access for human powered machines and smaller motor vehicles like e-scooters.