I don't claim to be much more than an average guitarist, but I certainly notice that an electric can be far more forgiving of a guitarists technique flaws than an acoustic will be. The string gauge observation makes a lot of sense, and the sustain of an electric vs. acoustic also makes a huge difference. Then there's the HUGE matter of sustain and how that affects playing style. "Dazed & Confused" sounds incredible on an electric, but empty on an acoustic ... because of the sustain & the bending ability.
As a further example, on the acoustic playing open / traditional style chords sounds much nicer, and offers a lot of flat-picking interplay within the chords. The guitarist doesn't need to think much about dampening, as the sustain isn't enough to garble the overall sound. On the electric, barre chords seem to sound much better, and the guitarist must constantly be dampening the string(s) to avoid the cacophony.
I'm not saying that one instrument requires a different skill level than the other, but they both require an adjustment in playing style. An acoustic can function quite nicely as a solo instrument, whereas an electric lends itself better to an ensemble. Apart from the fundamentals, they're almost two different instruments.