The diminished security resulting from the increased likelihood of a (single point of failure) supply chain attack.
Yes its possible for malicious devs to trojan apps, but due to apk signing it is much more difficult for a third party entity to induce a supply chain attack, which is my real concern when it comes to phone security.
If you have a lower threat model, this post isn't for you...
Sure, atleast you admit there's a trade off (security) for (FOSS) and maybe some additional privacy.
People should be made aware of the risks and choose according to their threat models, which is why I've highlighted some of these issues to begin with.
Sure, I'll spell it out for you since apparently the point went right over your head. Fdroid devs are a single point of failure by signing every application themselves. This introduces a potential for supply chain attack, not to mention Fdroid running on EOL servers.
When you use an individual dev repo, you can avoid any trojanized apps from Fdroid because the developers maintain their own infrastructure and sign their own apks.
You can't use online maps anonymously. Even if you downloaded offline Google Maps, you cant trust Google not to upload your historical data the moment you get internet connection.
Organic Maps and Osmand+ work on Graphene without google play services and 100% offline.
Pixel GrapheneOS gangggg