I faced the same issue that overwrites a note's content by another one more than once. I am a free user, I don't have History feature. So I had to dig into the local Evernote's database and look for the old notes there. I found them, but the formatting was all gone, the entire note was in one big line, no commas, no signs etc... I have to reformat a giant line to make it the note readable again..... It was a big pain.
I reported the bug but no one responded, no update was released etc... so I just went back to v6.7.
I am surprised like you, that the Development team doesn't test their s