No. I myself use F-Droid, and my knowledge of Android development consists of editing a line in an XML file in AnkiDroid and rebuilding the app with Gradle like the readme says.

And even if the share of nerds is higher among F-Droid users, I still don't think coders often go “wait, this app is open-source, let me build it myself instead of getting a binary.”

I don't think that's the case at all. F-Droid is very user-friendly. It supports advanced users, but then all software should.

Tech generally arrives in the consumer space only after becoming the standard for developers.

Literal wizards, they build from source.