Even if you think what you would say is obvious, please add. This is genuinely something I think makes sense regarding local bus routes given the longevity of light rail and how infrequently routes change, but I also suffer from confirmation bias, so I’m hoping for reasons this would be a terrible idea but obviously would prefer reasons it would be an even more amazing idea than I thought.
Trolley buses are good. But light railway lasts longer and does less damage to the road for vehicles that actually need to drive. Also you can go autonomous with light railway which is far easier on tracks than without.