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.
Tramways and Light Rails are much more silent and comfortable. Rails are smooth, no pothole etc. They are also much much more durable than asphalt.
Rails take less space and can be covered with grass/greeneries. Looks prettier and absorb heat.
From inside, maybe? Berlin, where I live, has lots of trams all over the city. I admit I rarely use them as I much prefer my bicycle, but they are seriously noisy. During the day the noise is somewhat lost in the general cacophony of city life, but in the evenings you can hear them rattling and crashing along from streets away. And if you live on a road with a tramline, you just have to accept this horrible metal-on-metal screeching and rattling at almost all hours.