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$\begingroup$ "it is doubtful that they will make many changes" - I actually expect there will be many changes by the time they go to Mars. Starship has only just started flying, already there have been major changes like carbon fiber to stainless steel, and hot staging. Besides stretching, Elon has more than once talked about wider diameter, although apparently not in versions 2 and 3 based on his recent pep talk. Not disagreeing with your points about three core, but in 20 years when they send humans to Mars, Starship will possibly be different in many ways to these early prototypes. $\endgroup$
– Steve Pemberton
Commented Apr 22 at 12:57
$\begingroup$ @Steve Pemberton Yes, no doubt Starship will be different in 20 years but many due to early development, followed by stretching and more engines. Once they have it working well I suspect the changes will be a lot more minor - as is now the case with Falcon 9. No doubt any Mars or Moon bound Starship will need a lot of work as they will be very different versions with different tasks. $\endgroup$
– Slarty
Commented Apr 22 at 19:30

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