I think it's the idea that nothing can be 'stand-alone' any more/There always has to be a prequel/sequel if it's successful/& watchmen has become an iconic singular piece of work so widely appreciated that it's hard to imagine strands of it working out of

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You can make a case that Watchmen is complete and doesn't need sequels or prequels.

I think that's the only real defense here, is that they might not be needed.

If the agreement allows them, if top creators are used, if Alan himself planned a prequel at some point, I think a lot of the other objections seem kind of moot.