The
City of Philadelphia has a steam system that supplies steam to about 500 customers, if I remember correctly. It's been decades since I've been there, but I recall the steam vents located around town. Homeless people would sleep atop the steam grates located at certain intersections. The system is still in use today. If you research that, perhaps you could find out the pros and cons of centralized steam generation. I bet the initial infrastructure is pricey. And certified boiler operators would need to run such a public system.
Back in the 70's I worked a few years at a very large commercial
greenhouse operation that used steam heat for their greenhouses. They had a central boiler and miles of piping that went to their numerous greenhouses. The system always seemed to work. But I had no involvement with it, so I can't say how well the system functioned or anything about the maintenance, costs, etc.