That's precisely the success reason for snapchat: my wife and I (both engineers) tried to use snapchat and failed 4 times (installed, tried it, uninstalled). I watched my niece use it for the first time, they were able to post photos almost immediately. It's when I realized:
1) oh shit I'm too old to understand the new product.
2) when my niece's generation start to get old (say 5~10 yrs from now), snapchat will have to launch a completely different product to grasp the next generation.
The trouble is, Snap is much like Apple with Jobs: they rely on the founder for every decision, and the founder makes decisions with his gut feeling, disregarding experimental data. Hopefully he's the next Jobs. Otherwise they're f**ked when he turns 30 (4 yrs left).