There might be benefits with trams, but I do not know what.
There is obviously a trade off, some routes are obviously suitable to trams, some others to buses, be they all electric or hybrid. So possibly in ICE mode out of urban areas, and on battery within?
Good tram systems don't share the asphalt except at intersections making public transportation a win for the individual which in turn reduces traffic. Buses always suck, that is an important part of their design.
Trams and trains are incredibly energy efficient even with heavy loads because of that.
In the long term their TCO wins.
> Tracks are also dangerous for bicycles, and slippery for cars and trams
Not really. Besides, bicycles should have their lanes anyways.
They should be, at least. San Francisco runs historic (interesting, attractive) cars on the Market Street line, some of which sound and feel like the rails are surfaced with gravel.
Every time I ride one of the orange cars from Milan Italy, I am reminded that the Milanese in the 1930s had bigger things to worry about, and that I should just get over it. :)