Because I don't care for what those things do to programming environments. If you take more than a superficial look at Decker, you might find it is capable of

Because I don't care for what those things do to programming environments. If you take more than a superficial look at Decker, you might find it is capable of quite a bit more than HyperCard in an emulated Mac Plus. If you want it to look different, the project is free, open source, and permissively licensed; do as you please.