Generally speaking these "home inventended" UI tookits are a novel idea but not usable in practice because they always fail to follow standard desktop conventio

Generally speaking these "home inventended" UI tookits are a novel idea but not usable in practice because they always fail to follow standard desktop conventions and things like moving widget focus, cut/copy/paste, RTL text etc. are always broken in some funky ways. Also there's a reason why a lot of effort has been put into standardizing the look and feel of applications. It really sucks when some "we're special" app has their own buggy toolkit that doesn't work properly. Sigh.