Georg von Lemberg
The trash tiles are actually very powerful.
The trash tile doesn't just block crows, but it also gives you a sure-thing. When you place a trash tile, the tile you replaced is put back on the board as if it were just drawn. Meaning you can trash a graveyard in a bad spot, then place that tile somewhere better and put your object on it. We didn't realize this until someone combed the rules carefully!
EDIT: Location of this rule is top right of the second page in the rules.
Thanks this is a very useful observation. I don't think I would have ever picked up on that myself without someone pointing it out.