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.
The network troubleshooter often works alright. Just never run it if you have setup a bunch of virtual switches in hyper V or something, because it will delete them or otherwise fuck them up and it's pretty annoying to restore (you have to remove them via device Manager and stuff)