How do we get this into mainline GIMP? As a GIMP user since it existed, I can say that the default interface "works" but the ux isn't great. This looks like a marked improvement and would give me something more like Inkscapes UI but for raster images instead of vector...
If they were going to mimic a more Photoshop-like UI by default, they would've done it. GIMPshop was around over two decades ago