Not saying you're wrong, but I wonder what is the differentiating factor for software? We can build huge things like airliners, massive bridges and buildings without starting small.

Incremental makes less sense to me when you want to go to mars. Would you propose to write the software for such a mission in an incremental fashion too?

Yet for software systems it is sometimes proposed as the best way.

> We can build huge things like airliners, massive bridges and buildings without starting small.

We did start small with all of those things. We developed rigorous disciplines around engineering, architecture, material sciences. And people died along the way in the thousands[0][1]

People are still dying from those failures; The Boeing 737 MAX 9 crash was only two years ago.

> Incremental makes less sense to me when you want to go to mars.

This is yet another reason why a manned Mars mission will be exceedingly dangerous NOT a strike against incremental development and deployment.

[0] https://en.wikipedia.org/wiki/List_of_building_and_structure...

[1] https://en.wikipedia.org/wiki/List_of_accidents_and_incident...

All of the things you mentioned are designed and tested incrementally. Furthermore software has been used on Mars missions in the past, and that software was also developed incrementally. It’s proposed as the best way because it’s a way that has a track record