A very powerful endpoint for users would be to pull service history for an HVAC system, supply current symptoms of a fault, and have grok recommend diagnostic steps.
I see the most powerful connectors as solving problems that involve “grok”ing a lot of data quickly, distilling it or reasoning on it for uses.
I’m working on a SaaS platform for small HVAC companies that does business management - customers, jobs, pricing, scheduling, customer equipment.
A connector for users to creatively hit the system APIs would be cool for existing users.
If there were a way to publish publicly available connectors, maybe a way for people to find a local repairman.