In a few weeks, people will line up to see a Norse god, his brother, and an irradiated green knot of muscle fight through an alien planet to try and prevent the apocalypse at the hands of the Norse goddess of the underworld. Soon, that same group will join the Black Panther and others to stop a genocidal, nihilistic alien warlord from warping the properties of reality itself with a gem-encrusted glove.
I understand asking questions about the fiction but there's something inherently disingenuous about trying to hold this MCU movie to realistic standards. Hell, just from this trailer the "unreasonable" things we see are super geniuses, hidden civilizations, a cloaking field, clothing that assembles itself over the wearer, remote-operated vehicles, and hover cars which all are almost generic elements in science fiction in general, let alone elements that aren't unfamiliar to the rest of the established MCU and the comics themselves.