The mere existence of this tool highlights the complexity and opaqueness of the electoral college system compared to the popular vote. You can't expect a layperson to have a somewhat accurate mental model of this probability breakdown and I believe it totally erodes their motivation to vote in the first place.
I don't think the electoral college is that opaque, or complex. It's certainly more complex then a straight popular vote. But consider that there are many many parliamentary systems in the world that have a degree of complexity and subtly on the same order as the electoral college (though the unequal sizes of states does mean the EC is more complex). I certainly don't think the electoral college is a good system for…
There should be either a two-tier system with points from winning a state and from getting the most votes, or just straight popular vote. Granted, in that case the smaller states would probably lose meaning but eh. Isn't that what democracy is about? The most popular candidate should win?