So if I buy a used car they can’t do all that right?

Right?

Yes but why would my car accumulate road salt while sitting in my driveway and how would storing it in a garage make this less of a problem?

My car lives outside and I literally don’t do anything to it besides oil changes and occasional tire replacements. If all you have is a daily driver you really don’t need a garage.

Wouldn’t it be more environmentally friendly to store your cars outside and not have a garage?

Poor management and time pressure are the answers. It often looks better to push some shit code and then push the fixes later than it does to take twice as long to verify a good change.

That can lead to another problem though, which is that if a developer knows a merge is only part of the whole change, it becomes easy to assume any issues will be handled elsewhere.