nice opinionIt's a visual opinion. Like some people shoot 8K because they think anything less may look inferior.
The GH5's slow-motion is decent, but its processing is hindered. It does not provide the best quality it can (for obvious reasons like price and because it's a stills camera that shoots video). If you had access to other systems and saw the results side-by-side, you'd see that the 180fps is soft compared to other hardware's output.
On a technical note, usually the higher you increase the framerate, the worse the results are (noise - chroma - compression) unless the camera is specifically designed for high-speed.
With that said, if you think it looks good then that is all that matters.