Though in seriousness, YC has said it is more about funding people than specific projects. And who knows where this lands on the path to the destination.
Personally I love seeing a funded company that's focused on client-side software to improve the productivity of general knowledge workers. It's a nice counterpoint to SaaS everything. Yes, there's a subscription fee. But that ensures ongoing development.
Looking at this product, I'd expect it to grow into a powerful, personal RPA product. They could build a high quality, MacOS-native view into all the APIs in your life, with automation tooling and a great mobile story.
In the thread, it was obvious that for some people it would alleviate a pain : keeping track of synchronous events across multiple platforms.