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Why aren't all rooms holodecks?

It just popped up in my mind.

  • You could decorate any room as you like. You don't even need to step out of it most of the times.
  • Other people can be projected inside it like Voyager's doctor.
  • Also rooms could be much smaller. They only need to be big enough a human(oid) can fit inside.
  • In emergency cases most holograms can be shut off to match increased energy demands by weapons and shields. You only really need seating/bed and a (non-exploding) console screen.
  • Much of the specialized rooms like a bar, med bay, etc. won't be needed anymore as a holodeck can imitate all of them.

It irritated me a bit that a Discovery gets fancy floating warp nacelles but holodecks are... wait, does Discovery has a holodeck? I don't remember seeing one.

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  • OG Discovery had some kind of combat simulator (kind of a proto-holodeck) that Lorca and Tyler used to train for a mission.

    After the 31st century refit, the cabins used programmable matter for their furniture, etc. My understanding is that programmable matter is the transistor to the holodeck's vacuum tube (i.e. it made holograms obsolete). Ok, I said that, but there are advanced holograms at HQ, so I guess holography hasn't gone totally out of style. I don't recall if it was ever established as such, but my head canon is that programmable matter is more efficient for "static" objects since it doesn't need energy to maintain form, just when it changes (unlike holograms which require constant energy). That would explain why PM is used for furnishings/decor and holograms are still used for humanoid constructs.

    As for why all rooms aren't holodecks/suites in the 24th century, probably due to power consumption. In VOY 4x18 "The Killing Game", the Hirogen had Harry Kim expanding the holo emitters throughout the ship which seemed to be putting considerable strain on the ship's power system (despite not being in battle or at high warp; perhaps not in warp at all -- been a minute since I saw that episode).

    While the Prometheus had ship-wide holo emitters and seemed fine power-wise, there's a difference between projecting an EMH (or two) versus simulating an entire environment plus the associated NPCs.

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