Don't underestimate the power of plug-and-play ease of use and the inclusion of dozens of ready-to-go example programs. And good documentation. And a welcoming,

Don't underestimate the power of plug-and-play ease of use and the inclusion of dozens of ready-to-go example programs. And good documentation. And a welcoming, friendly, active user community. And marketing to people who want to make something light up or move, and don't (yet) have a need for an onboard debugger.