SpaceX could absolutely launch a mars mission with their existing rocket platforms and launch infrastructure.
It would be tedious launching little pieces of a larger ship and assembling them in orbit but it could absolutely be done.
Instead of doing that they're choosing to build better, bigger rockets, and more infrastructure to make the eventual launches to mars more cost-effective and substantial.
> SpaceX could absolutely launch a mars mission with their existing rocket platforms and launch infrastructure.
Which highlights the major difference between public and private sector exploration. SpaceX killing everyone on their first attempt is a tragedy and they quickly move on, NASA doing it is a 10 year halt to any further work until a full public investigation takes place.
It would be tedious launching little pieces of a larger ship and assembling them in orbit but it could absolutely be done.
Instead of doing that they're choosing to build better, bigger rockets, and more infrastructure to make the eventual launches to mars more cost-effective and substantial.