Another benefit of cosmo compiled apps is debugging. I won't get into pledge/unveil but check this out:

On my compiled python.com I try to open an app with a socket already in use:

./o/third_party/python/python.com run.py --strace

  SYS  15995        443'293'703 read(3, [u"egister(self, selectors.EVENT_READ)◙◙     "...], 8'192) → 8'192
  SYS  15995        443'440'589 close(3) → 0
    self.socket.bind(self.server_address)
  SYS  15995        443'471'588 write(2, u"      self.socket.bind(self.server_address"..., 42) → 42
  OSError: [Errno 98] EADDRINUSE/98/Address already in use
  SYS  15995        443'523'517 write(2, u"OSError: [Errno 98] EADDRINUSE/98  /Addres"..., 57) → 57
  SYS  15995        443'533'391 getenv("PYTHONINSPECT") → NULL