When leaving SYD a couple of weeks ago we were a little overweight but had prepared by having some easily removable items in a plastic bag - cosmetics, shampoo, sun block etc., which we offerred to the check-in agent and were readily accepted. We shifted a bit more into our backpacks and were still slightly overweight - but then all was well.
The agent thanked us for making the changes and showing willing, "Many passengers don't want to make any effort and - if it's a bad day - some of my colleagues relish the fight ...!"
You still get what you pay for!