I do not think your professional experience is representative in any way of what is better for very young kids.

I know some musicians and I can tell that actually playing the instrument is not the hardest part. That does not mean a toy piano is not a good present to get a 5 years old started. And if painting the keys in colors instead of black and white (icons instead of text) makes the kids more willing to play it, I think it is something very interesting (more for toy piano manufacturers than musicians though).