That would be rather depressing, if true. There's only a couple strands, so it would seem that FTL travel is very very rare. Among the 100 billion stars in our galaxy, only a handful have used FTL travel in the last 25,000 years?
One single evidence of physics breaking aliens would be the most cheerful thing in my lifetime.
Maybe the costs are *ahem* astronomical, so the tech is reserved for very large ships, only needing or affording a few trips. You know, like our one ever visit to the Moon.
Maybe they’re the tubes connecting gates or wormholes carrying a regular traffic of thousands of ships.
You know this is not factually true, even if you just consider the Apollo project.