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Originally Posted by Hemi-Cuda
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I googled this and actually found a really good explanation:
Spoiler!
Right now, even the most advanced ships in the MCU can only travel rapidly through space using the Universal Neural Teleportation Network. The Network is an artificial system of fissures in the space continuum, called Jump Points, that enables ships to fast travel across the universe, jumping between different planets. This system requires a ship to plan a specific sequence of multiple jumps to get from point A to point B.
In Guardians of the Galaxy 1&2 and Captain Marvel, you see jump points that look like a honeycomb pattern with gates that open allowing ships to fast travel through these fissures which could be assumed to be a type of wormhole.
There's a point in Captain Marvel where Yon-Rogg and the rest of the Kree have a 22 hour travel period at what I assume must be sublight speed just to reach the nearest jump gate to Earth.
In Guardians, they set a destination with so many connected jump gates that you get this crazy scene: Guardians of the Galaxy Vol. 2 (Scene) - 700 Jumps (Face Distortion) HD
This means that a lightspeed engine would be a HUGE deal because it would allow ships to travel faster than light outside of the network of jump gates. Instead of having to plan your travel route within what is essentially a mapped highway system of jump points, you could literally take the straightest path from point A to point B in one trip. Not only would this streamline travel, it would make it impossible for another ship not equipped with a lightspeed engine to track or follow your ship.
https://www.quora.com/Why-was-the-li...ed-engine-ever
They probably should've explained this in the movie though, because I was wondering it as well.