Easily said, there are over 100 coins out there, not sure how we're expected to know when to check for a complete change in a coin rendering all previous coins worthless. Its not practical to check every thread on every coin, constantly.
Pretty much - that's why after losing some MMXIV coin due to an incompetent dev - I swore off following any other BS that the guy put out. Fortunately since I was actively mining ruby - I happened to notice the note to move them all to bittrex before the date. I'm sure I still ended up losing some due to the time between being mined and the time that bittrex upgraded, etc, I think I left with about the right amount on this one.
Overall though - I'm against any coin that does a hard fork and says to previous holders - too bad, so sad, you lose, game over, up yours and you should have followed the forum posts....