Hah, that's funny! But also, comment #35 is on point:

> The problem: Moving away from a form can result in data loss.

> Your solution: Make it harder to move away.

> The correct solution: Cache tab history completely and make it easy to move forward and backward in a tab's history by reusing cache and maintaining form contents.

(Source: https://bugs.chromium.org/p/chromium/issues/detail?id=608016...)

I never have this problem in Safari, and I use backspace all the time for navigating back.