What would it cost to buy?
How much maintenance would it require?
Special fuels? Kind of oil? Required additives?
Suspension and handling? Comfort?
What would potholes do to it?
Now compare all of that to an older but still decent condition used modern car that is way easier to find and obtain.
Now why is the model T still useful?
Note.. I'm not arguing that it might not provide the owner with some form of enjoyment. I like all sorts of things that I do not consider ot be 'useful'.