I don’t understand your complaint, are you complaining the game crashed and you failed to save or are you complaining that the game doesn’t insta-speed through actions?
Each time you add a board or any vehicle part, you complete work on it and then have to initiate the next action, right? So in six days of work you had dozens and dozens of opportunities to save, the crash sucks but it’s your own fault for not saving.
The game doesn’t jump-cut for a reason. The world is moving around you and it wants to give you time to react to outside events. How else would you simulate the passage of time? You could insta-jump to completion, not simulating the outside world. This is obviously not very realistic. Or you could continue simulating the world but not give the player an opportunity to intervene – which would really suck.
Or you could simulate the world and pause anytime there is something the player needs to know. This is basically what the game does now, rapidly passing time and giving you the opportunity to decide what outside stimuli are worth halting progress for. It can be a pain in the ass, but it’s preferable to having a Jabberwock come and eat your face while you’re welding.