In a fiberglass car you only have seconds to get out. An impact switch won’t save you).
Back in the 70’s my younger brother bought an MGA. It was a near finished restoration and came in grey primer. He and my mate spent two days trying to get the engine running. The car also came with a second set of carbs & manifold, so they changed them over to see if it made a difference.
The car fired up and they decided to take it around the block for a test.
About a mile from home, he lost control and the car ended up on it’s side, jammed behind a power pole in a cutting.
My brother couldn’t move. My mate heard the fuel pump ticking and figured the best thing to do was to drag my brother from the car before something happened.
It turned out that my brother had broken his spine.
After three months in the spinal unit, he walked . . flat footed and on crutches, but he walked.
He still walks flat footed but otherwise, normally (no crutches). He needs to take daily medication for things like UTI’s but he’s also fathered five kids that the doctors said he’d never be able to.
So, yeah . . it’s common to hear YMMV and that’s still true. This is just one data point.