Let's see. People who have never used packing cubes tell me why I don't want them. Yeah, that makes sense. 🤣 I love packing cubes. I have four of them that nicely fill the top half of my full size checked bag (the other half is generally empty except for my slippers and a zip lock or two with laudry bag accessories and first aid stuff). When I get on the ship, I grab all four at once (they have nice handles) and flop them on the closet floor. Done! Other than sticking my toiletry bag in the bathroom, I'm unpacked. Each morning, I grab them and flop them on the bed. A few unzips/zips and I have my clothes for the day. DW can do whatever she wants with the drawers and main body of the closet.
Bottom line: packing cubes are mostly about convenience and organization. Their main purpose is NOT getting more crap packed into a suitcase.