If nothing else, it's intimidating because if they can detain you under a terrorism law for doing journalism, it stands to reason that they can bend or abuse some other over-broad law to actually charge/imprison you depending on the interrogation. Also, you get to hand over every piece of electronics you're carrying for an indefinite period of time. If and when you get any of them back, you might as well assume they're bugged or otherwise compromised, so they're essentially useless unless you want to try your hand at finding any backdoors that might be there. Fun.