I have been a KDE user since pretty near day one, so I’m by no means bashing KDE. However, for something doing such critical operations as partitioning I always rely on gparted. I have encountered far too many bugs over the years with KDE’s partition manager to feel confident relying on it.
I actually prefer the way the KDE’s PM GUI looks and how it is laid out. I just don’t have the confidence with its stability compared to gparted. I still keep it installed and view partition information with it, but if I’m actually going to do partitioning I rely on gparted. I would put it in the same category as pamac. Pamac is a great way to search for and view available packages, but I always use the terminal to perform system updates. Looks just doesn’t trump reliability in my book.