Shit like that is why I love hard sci-fi and absolutely hate it when people treat bubblegum sci-fi concepts as something that could be done in real life. They don't seem to get the notion that however long it takes you to get up to cruising speed, it'll take you exactly that long to slow back down. There's a reason why the ships in The Expanse flip at midpoint in a flight and why the Starfury fighters in Babylon 5 can shift and skate in combat, and these mouth breathers don't seem to get why.