Which is exactly what most people want. They want to find people with similar interests and share ideas. Don't go to the anime subreddit expecting to find anyone who's interested in a negative critique about anime.
Literally every time you see a startup release a product that seems trivial it's because that's not the full story. You're judging without complete information. For example, the public face might be a simple Mac calendar widget, but that could be the gateway to calendar sharing, native office apps, meeting booking, event management, ticket sales, corporate flight sales etc.
Building an audience with a cheap tool that solves a tiny pain point for a lot of people is a great way to build a direct relationship with a market that you can then sell other services to.
I'm not saying that's the case here. Maybe their business is actually a widget. I'm saying that most businesses do far more than you can see from the outside.
I am somewhat familiar with both, UI/UX and keep relatively apace with a few fields of research. Currently, I'm working to become good at front-end development.
This is an area I'd like to work on, if you have a project that could use someone like me please hit me up here (a comment with your email) or via twitter (@_areoform).
