i don't think all trams should look like this, but having old vehicles in active service should be an utterly universal thing.
Gothenburg has a line from the central station to the amusement park which is run as an extra service by the preservation society, you can use a normal public transport ticket or pay directly to get an oldschool paper ticket 😍

that's the model i want to see on every network: pick a shorter route where many people will see the trams and tourists can use them as part of their trip to touristly places, integrate with the PT agency, and just run whenever you can.