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LOL Yep, depends is always the correct answer.Dumb answer: Depends on the die, and how you want to use it.
My arbor press (neck only) LE Wilson die just uses a bushing - final interference fit is set by selecting the bushing, rather than opening it back up with an expander.
I believe some (most?) FL bushing dies use an expander plug (I don't have one - I have a Redding neck only die that has a decapper built in, but no expander plug.) On that note, I see no reason you couldn't get rid of the expander and set diameter with just the bushing. You'd still need a decapper assembly, unless you do that as a separate step. But many people like using a plug of some sort to set the neck tension; up to you I guess.