I see buses as a good method of figuring out routes when first implementing a transit system similar to how some developments leave out walking paths to see where people typically walk and install them afterwards.

Generally though, trams can allow for more passengers transported per trip and per operator than a bus. Good for high and low traffic areas with dedicated transit lanes.

Don’t get me wrong - trams certainly don’t replace buses. Multiple forms of transit are best practice of course. I just don’t see the need for only buses or mostly buses.

As a minor detail, tires are one of the top polluters of both microplastics and noise levels in cities, and it would be nice to lower the amount of them being disintegrated in the process of moving people from place to place - be in from buses, or the larger culprit, private vehicles.