Leadballoon - heading south in the coastal route. There were small cumulus clouds FEW at 1000 ft between Newcastle and Anna Bay, of course, when your route is exactly prescribed, surprise, a puffy bit of a fluff is right in your way. Most people would probably just hammer through it, but I try to actually follow the rules. Avoidable if I had deviated a bit out to sea (not a huge fan in a SEP) or inland (definite no-no to WLM ATC) so how is going under it unreasonable? It's not even dubious in legality.
Don't assume everyone is cutting corners in marginal visibility
