I didn't know GIMP nowadays run natively (without X11) on macOS, cool.
1. when you start it up from launcher, it doesn't show up in the foreground, so you have to click the icon again
2. if you have multiple monitors and you plug out the monitor with the gimp window it sometimes crashes. It doesn't happen every time, but as I precaution I first move the Gimp window to the other monitor before disconnecting.
2X displays might seem frivolous to non-Mac developers but they've been the norm on OS X for several years now.
Free = not enough, paid = expensive and bloated
Getting tired of this rule when macOS has apps on the sweet spot at affordable prices.