The exclusion of singles over the congested area of cities is almost as old as the regulations themselves.
and it would appear that those complaining about those rules are doing so purely from a selfish standpoint - 'I want to fly my single over the city but the authorities won't let me'.
No consideration for the safety of those living and working in those congested areas who might suddenly find themselves wearing a helicopter (yes I know it happened in London but that was CFIT not and engine failure).
Since great deliberation has gone into protecting the passengers, crews and the population before deciding these rules, why should they be changed to suit a few selfish individuals?