Post Scarcity Cthulhu: the post-scarcity galactic civilization is happy to share their technology with us. And it’s very, very alien, mostly organic.
e.g.: You can access the Galactic Information Network, but the implant most compatible with humans looks like a giant scarab beetle that covers the top of your head (it replaces the top of your skull). Exposure to alien thoughtforms makes you somewhere from openly weird to a raving loony.
All the best stuff is preadapted for other species, and it's up to humanity to figure out ways to adapt things that have been through millions of years of evolutionary design, based on fundamental principles that people are still trying to figure out. As humanity figures it out, the human-designed stuff works well for humans (as well as human engineering and QA can make it), but is much less effective than the standard galactic designs.
Humans, of course, can cause cognitive dissonance among aliens just like the aliens do among humans. A loud Hawaiian shirt tends to freak out predator species that rely on stealth and camouflage, for instance. Rigid endoskeletons are icky to tentacled beings with hydrostatic skeletons.
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