I'd rather not have reliable fast travel, I'd like the galaxy to remain vast and mysterious.
I did once put in a suggestion for "wormhole travel" using black holes, but only to another completely random black hole elsewhere in the galaxy (re-randomised every time). And your ship gets badly damaged so you can't keep on diving into black holes indefinitely, after 3 or 4 you'd have to limp home in a heavily damaged ship from wherever you ended up.
I see others have been thinking along similar lines. Not fast travel to any specific location, just a way of "throwing yourself out into the black".
I'm just not understanding why people would only want a sector-jump ability that causes damage to the ship or that could potentially randomly send you somewhere totally different. i'm obviously not the intended audience for exploration! I don't see any value in spending hours jumping, or even 10 minutes tbh