I don't think they're the same thing. Web ads, and the current iFly flashing alert icon, are ubiquitous and often unimportant. Lots of "falsing." Whereas gear horn hardly ever happens, when it does it's always near the ground, and you know it's not false. On top of that, there's only one type of gear warning, we know what it is, and we train to react to it. (And lights AND horn, to get your attention while you're flying. Whereas with iFly, you have to have your head down to see the alerts and might miss them if you're flying.)
Now, if iFly alert icons were few and far between (truly calling out an immenent threat) and always obvious, and with voice annunciation, I wouldn't become conditioned to ignoring them.
In our Glasair, I built a circuit (wrote about it in KITPLANES) that verbally calls out out of range conditions. (Like, low oil pressure, low fuel pressure, etc.). In 4000 hours, it's only alerted a few times. So it's always gotten my attention.