I disagree entirely that electronic tools (aka instruments) are not advanced enough. My modular synth (to pick something at random) is as capable of advanced musical expression as anything, whether that be melodically, harmonically, rhythmically, emotionally, or any other -ally you can think of.
For sure there is plenty of bad electronic improvisation, just as their is bad “traditional” instrumental improvisation, but I think your quote above is more true of poor collaboration skills than anything inherent in any type of instrument. And this gets amplified when instrumentalists from different worlds collide, and spend more time playing what THEY know, when they should be listening more.
In the right, sympathetic hands, with no planning, a rock and, say, a Commodore 64, could happily improvise music together.