Cedrick with a controversial first post. Are you privy to any intel beyond the box scores?
U16B won a silver medal. There was a likely successor, but he decided to take an NBL1 opportunity instead. It probably shouldn't be the HP manager, but if others aren't up to it then they shouldn't be appointed.
U16G were terrible. Was this due to the coach or players? Many have been quick to blame the coaching staff, but several players have been an issue at club level and that playing group has underperformed year after year. Inexperienced coaches and a young, difficult playing group wasn't a good mix, but who should've been appointed instead? Not necessarily the wrong call.
U18B are overly structured, but have consistently performed well for 5+ years straight. Again if nobody else up to the coaching standard applies, BSA can't appoint someone substandard.
U18G won a silver medal and got flogged... by the most stacked team in the better part of a decade. Coach was won a medal every year, with three grand finals and a gold. "Probably" should get another go?
I'm sorry you didn't get appointed or your kid has to go through another year with coaches you hate. Get over it mate.