it's always easy when you're not the one making the changes on the system you don't understand. is there a name for that? I feel like it's a common enough thing people do that it should have a catchy name.
Eh. To say that something that used to be mechanical should be possible with a mere few million lines of code seems pretty obvious to me.
Or compare to the Apollo missions and the space shuttle being well under a million.
I'm not saying that it would be easy to redo the entire system from scratch now, I'm just saying that if it was a design goal from the start it wouldn't have been very onerous.