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.
Well its still not a image manipulation feature missing. It's a workflow feature. You could also just copy a layer. But in the end, Photoshop has no image manipulation feature that is really missing in GIMP, you can export the same result picture.