Yeah, basically that. I'm back at work in Windows land on a Monday morning, and pondering what sadist at Microsoft included these features. It's not hyperbole to say that the startup repair, and the troubleshooters in settings, have never fixed an issue I've encountered with Windows. Not even once. Is this typical?
ETA: I've learned from reading the responses that the Windows troubleshooters primarily look for missing or broken drivers, and sometimes fix things just by restarting a service, so they're useful if you have troublesome hardware.
It used to fix WiFi issues for me back on Windows Vista (bleh). Vista would always have issues when I woke my laptop from sleep mode, and my WiFi would be disconnected and unable to reconnect/properly turn off. Running the troubleshooter would restart my wireless card. Other than that I haven't encountered anything it's helped, but I don't use windows too often these days.