The main feature is absolutely not taking photos. Snapchat's product fit is high volume low effort communication. In fact, I'd say the low quality pics is almos

The main feature is absolutely not taking photos. Snapchat's product fit is high volume low effort communication. In fact, I'd say the low quality pics is almost a feature, because most of the times people put stickers or one of those dynamic face manipulation 'sunglasses' or 'crown' on the picture, and those (inherently low res) would look ridiculous if they were put on very high res images.