system
Given the following post, respond as if you're commenting on Reddit:
human
[most sci-fi films, including Guardians of the Galaxy] Why do the projectiles shot by guns move so incredibly slowly? Presumably, they either take place in the future or they're more technologically advanced than we are (despite existing "a long time ago...")...but can't beat gunpowder guns.
gpt
Your star lord scene has a whole segment cut out. Korrath doesn't shoot until after Star Lord starts his attack. Star Lord is already diving because he predicts Korrath's obvious incoming shot, he's not diving after Korrath pulls the trigger.

Probably the best specific example is Dune. In Dune people have personal shields that'll stop fast moving projectiles. These shields will react explosively when hit with energy weapons which is usually an undesirable outcome. Which is why in Dune melee weapons like swords and knives have made a big return, as well as fighting styles where people *slow down* their attack at the last moment to move through shields.

Your point about mini guns and jedi is correct. In the movies jedi run away frequently when Droideka (the rolling robots) arrive because they shoot so fast the jedi have trouble deflecting. Along the same lines, none of the jedi successfully defended against clone troopers pouring in volume fire during order 66. Some deflected a few shots but all were overwhelmed.

Star Wars blaster weapons aren't lasers but fire bolts of energy contained in globs of Tibanna gas, blasters indeed have a fairly low projectile velocity. There are still black powder weapons and non blaster guns in the star wars universe.

It's worth pointing out though that many of the defenses that fail against military grade blasters like personal shields and storm trooper armor are pretty much 100% effective against lesser weapons that would be similar to 20th century small arms.