To be fair TouchID is just biometric security using fingerprints, which Apple was not the first to adopt in a smartphone. They were the first to get it working with high reliability for most users though. Also, the iPad was hardly the first tablet on the market. Old windows tablets from ages past were terrible, nobody wanted them, then years later Apple saw an opportunity and jumped on it. Now tablets have become mainstream. To my knowledge 3D Touch is the first of its implementation in a smartphone. If Apple does adopt a technology years after others they usually do a stellar job at it, but overall I wouldn't say the iPhone is always 2 years behind other phones. Manufacturers put in new technology at different rates. What Apple may put in quickly (awesome biometric fingerprint scanner), others are a bit slower; what others may put in quickly (QHD displays or OLED), Apple is slower to adopt. There's always something missing from a phone, which another phone has. If only there could be one superphone...