You've made an argument for looking through the projects which people whose opinion you care about have starred, not an argument for why GitHub stars are significant. Simply looking at number of stars doesn't provide you with much meaningful information.
It's also worth considering when someone starred a project. In my experience, people don't usually won't go and update their old stars, so it shouldn't be taken as endorsement. You don't know what state the project was in at the time it was starred. It's common for project to evolve over time, and it's not always for the positive.
The significance of starring a project is also poorly defined. Many people use GitHub stars as a form of bookmarking. You generally don't know the reason why someone starred a project. For example, just because someone has starred a library doesn't mean that they'd use it in production.
It's also worth considering when someone starred a project. In my experience, people don't usually won't go and update their old stars, so it shouldn't be taken as endorsement. You don't know what state the project was in at the time it was starred. It's common for project to evolve over time, and it's not always for the positive.
The significance of starring a project is also poorly defined. Many people use GitHub stars as a form of bookmarking. You generally don't know the reason why someone starred a project. For example, just because someone has starred a library doesn't mean that they'd use it in production.