system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel Universe] With the abundance of alien species whose flesh is stronger than steel, why are organic starships not more commonplace?

I mean, seriously. A friend took me on a tour around a few galactic hubs (read: fucking kidnapped me) and he managed to get into a number of fights along the way and EVERY DAMN TIME they were bulletproof and could tear bulkheads apart like a karate student breaking boards. Why even bother with metals if they're so useless?
gpt
It's waaaaay harder to make a hull out of living flesh than out of metal. First you need to find a supply of flesh that will withstand a vacuum and all the extremes of space (like hard radiation) then you need to cultivate it all, feed it, care for it, etc. 



Besides, the alloys used by the various races is more protective than flesh.