But as for the uniforms and interiors, TOS doesn't look very futuristic to me at all. It looks seriously dated. Even the iconic equipment employed, the phaser, communicator, and tricorder, all look like Art Deco relics now.
I wish people would stop using "art deco" to describe things which aren't. Nothing much in the original Star Trek is art deco.
Art Deco is a term coined in the 1960s and retroactively applied to a style of architecture, interior and product design, and graphic design popular in the late 1920s and 1930s. The spaceships and hardware in Universal's Flash Gordon and Buck Rogers serials look like Art Deco relics, because they are.
IMO, the most Art Deco-looking thing in Trek
TOS is the original Klingon battle cruiser.