Which is why I think that some of the same principles should apply to the other areas. As demonstrated by Glossop and Hadfield, services don't align neatly on local government boundaries, and the best* should not be the enemy of good enough.I think that ship's sailed. I do think it was significantly easier for people to know how far they could travel using PAYG when, as a rule, PAYG validity on non-TfL trains ended at zone 6. The further it is extended, the less likely it becomes that a PAYG system that can't accommodate Railcards or splits is giving people reasonable value for money. And I do think it's unfortunate that people who rely on TfL services and pay some of the highest fares don't get to vote in Mayoral elections.
* - as an aside, I'm not personally convinced that democratic accountability of this kind works at local or national level - or that, where it does affect politicians, it leads to good results.