How on earth are you going to tell the app what you want to draw, if you can't stand even a basic tool palette?
> Too much control: Playing with drop shadows, gradients...
Umm... these are actual very useful features for wireframing, because when you have a lot of black outlines, they help distinguish between elements. How on earth are you complaining about having too many options?!
> Responsive Responsive Responsive
You do realize that it's a helluva lot of work to design responsive layouts, because they can be responsive along any number of dimensions, in different ways? A "simple" wireframing app is going to get it wrong. That's not wireframing. That's mocking your stuff up in HTML in the first place.
Etc, etc...