Developers on Sandstorm don't have to maintain infrastructure. They don't have to protect and back up user data. They don't have to implement authentication, sharing, document management, search, etc. They don't need to think about consensus algorithms or distributed infrastructure problems. They can relax their security diligence as many common security bugs are mitigated by Sandstorm itself.

A guy in Turkey and a guy in France working in their free time built Wekan, a Sandstorm app that easily replaces Trello. Two people in their spare time vs. a whole funded company. There is no way that they'd be able to build and run a SaaS service competing with Trello -- and no way I personally would use a service run by two random guys in their spare time -- but building a Sandstorm app was no problem for them, and has been incredibly useful to me.

To me the question is: how will SaaS developers be able to compete against Sandstorm developers that can build apps so much more easily?