I've been main healer, and whenever I DPS I can ensure you the first thing I do is make sure I get to use LB (assuming my LB is the most beneficial to the party in that content of course). I just consider it to be a part of the DDs' job to handle it the most beneficial way.
You are not everyone, and everyone is not you. I said, DPS can tunnelvision or forget. I never said you did. I am addressing the fact the playerbase doesn't play perfectly everytime.

So mistakes happen. While it is part of the DPS's job, forgetting to LB happens. It's why as a tank/heal main I simply remind DPS to LB when neccessary and boom, a LB follows. Hence why it is never a peeve of mine.