[kstrauser]

You're right. Classes don't even provide such operators by default:

  >>> class Foo:
  ...     ...
  ...
  >>> class Bar:
  ...     ...
  ...
  >>> a = Foo()
  >>> b = Bar()
  >>> a+b
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
  TypeError: unsupported operand type(s) for +: 'Foo' and 'Bar'

If anything, the complaint is that pre-type-hinted Python was too quick to raise a TypeError without helping you know what types it was expecting. The only case I can think of where it was too lenient was where Python 2 conflated strings and bytes. That change was 90% of the pain of the Python 3 upgrade, and now they're different types.