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Being able to block network access gives me peace of mind regardless if the app is proprietary or open source. Humans are fallible and life can get in the way (maybe the app has old dependecies with vulnerabilities, or any other random thing that I don't want). Being able to set the permissions I want only has upsides.

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Oh, fully agreed.

What would be more useful, however, would be the ability to selectively block network connections: for example, to allow the public transportation app to access its API endpoint, but not the advertising and tracking endpoints. I don't think LineageOS allows that, and I don't know if Graphene does.

You can do that on websites with Firefox and UBO. Unfortunately not many transit authorities consider the website as a firsr class citizen anymore.

Sounds like you want dns that blocks advertsing endpoints. Something like pihole or some other service.

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