It's the same as with Linux, GIMP, LibreOffice or OnlyOffice. Some people are so used to their routines that they expect everything to work the same and get easily pissed when not.
So my point is still valid that GIMP is not an alternative to Photoshop. It would be like saying this screwdriver is an alternative to this toolset. People coming from Photoshop aren't looking at the singular goal of image manipulation.