There's a difference in wanting the airline to improve vs. corporate shakedown. CX is already a very good corporation in handing out goodwill in my opinion. To take advantage of this will only make CX turning more into NA airlines rather than improving them.

Letting them know of the situation is already helping them improve. The crew will make a note into their work log and actions will be taken to address the issue internally. Also, we need to separate honest mistakes from harmful mistakes. The sense of entitlement that one can get compensated and take advantage from any and all situations is a laughable one. And like I said far from making CX better it will only make CX more hostile towards future claims as they are tired of being nice as it caused them to be shakedown by more passengers in the future.