If the rules "are there for a reason" then black cabs would be obviously superior and wouldn't be at a competitive disadvantage.In some ways, black cabs are obviously superior. To pick a few examples, their pricing is regulated by local authorities, they are required to be wheelchair accessible, and their drivers are required to have The Knowledge along with various other qualifications before being licensed.
To the extent that black cabs may be at a competitive disadvantage compared to Uber's standard (non-surge) pricing, that is in part because Uber's current financial model seems to be subsidising every journey using the vast amounts of funding they have accepted. That is not sustainable. It is also in part because of exactly the sort of issues we're talking about today, where they've been cutting their costs at the expense of their drivers in legally questionable ways, which again is hardly playing on a level field.