As ultimatums have to use some distinction—some either/or-construction—this always includes the escape/further negotiation via proposing another distinction.
Huh? The point of the ultimatum is that negotiations are over, you can propose what you want, but this does not provide any escape.
Yes, ultimatums in the default sense of “a demand whose fulfillment is requested in a specified period of time and which is backed up by a threat” are basically enforced commands. But apparently we are using many more loose readings of the term—basically those introduced by the OP. Namely either/or-constructions which interpret something real as contingent (otherwise no choice).
Huh? The point of the ultimatum is that negotiations are over, you can propose what you want, but this does not provide any escape.
Yes, ultimatums in the default sense of “a demand whose fulfillment is requested in a specified period of time and which is backed up by a threat” are basically enforced commands. But apparently we are using many more loose readings of the term—basically those introduced by the OP. Namely either/or-constructions which interpret something real as contingent (otherwise no choice).