Indeed, mixed signal simulations would be very useful, I reckon, for people dealing with sensors and that kind of stuff. Might as well simulate it before building it. It's currently possible with falstad's open source code base as well, you just have to program inputs and outputs but it's not very ergonomical let's put it that way.

In any case, I always encourage trying to be as open as you can with the software, this encourages collaboration/cooperation (and of course is just better for everyone, in most cases!).

I think (like others here) any slightly more advanced user would be more comfortable/productive in a 2D interface most of the time. But the option of having 3D for blinkenlights is sure nice :)

(also a great accessibility for people who can't afford to buy hardware for learning and experimentation but have access to a computer)