There seems to be a notion of 'Too big to fork'

I don't think it is true. Certainly it takes more work. Broad consensus may be part of that work.

If you cannot reach consensus to produce an equal product as a unilateral decision maker then the benefits of dictatorship are still outweighing the disadvantages.

If another unilateral decision maker runs a fork, people may move to it if it is better. That's them voting, it's not dictatorship, it's representative democracy.