How does GHOSTDAG avoid wasting mining work?

GHOSTDAG avoids wasting mining work by including all blocks mined in parallel in the DAG and rewarding every one of them. In traditional proof-of-work, only one block per round survives and all competing blocks are discarded as orphans — their miners walk away empty-handed. GHOSTDAG changes this: every block an honest miner produces is incorporated into the directed acyclic graph and earns a reward. The source states that at 10 blocks per second, zero honest mining work is wasted, meaning every joule spent on a valid block actually counts toward network security.