Before you say, "Who cares?" I am trying to get my son interested in electronics and he expects the PS to have a good looking display (like his Android phone).
While it's not "stupid" (that is a rather overused term, to the point of having lost its meaning), I do think that if the type of screen on a power supply is more important than how the power supply works, you have either a) a lot of work ahead of you or, b) lost before you have started.
As a parent myself, I don't know how I plan on engaging my child should they show an interest in electronics, but my gut feeling is that it shouldn't involve showing them a side of electronics that is purely cosmetic. If they enjoy it, then it should be because they really like the electronics part of it all, the designing, troubleshooting and building "things".
Good luck to you, and I hope your child does find an interest, regardless how they are introduced to it!