Why not. This is pretty much my game plan if/when I have kids: Start them off with a raspberry pi or similar, a keyboard and a monitor, then gradually explore with them and add more gizmos and software together. Some of my fondest memories as a child was playing around on my father's old IBM mainframe workstation computer with two 5 1/5 inch floppies as a three to five year old. At that age I really didn't need much, seeing something happen on a screen after some keypresses and some analog sounds coming from the floppy drive was enough magic for me. I'm thinking that giving a child an iPad at that age could be really damaging - there's just no sense of wonder and accomplishment outside the prepared paths anymore.