I would say it's still a bit more of a slower growth approach, but that can be fine. To be clear, I don't really have a dog in the fight, I was just questioning if faster growth is what Graphene wants versus an approach like you're describing. Both can be viable for growing, but even with your linux/Steam example, it's not like linux has taken the world by storm - it's still at ~4% "market share" (and that's even among Steam users). It's still very niche, really only used by gamers and coders.
But I think we're talking past each other, or at least with different assumed goals. My suggestion of showing features and having a more broadly appealing website assumes GrapheneOS wants to some day be on 30%+ of phones in the US (potentially supplanting Android). And I just don't see how you get there with the website as it currently is.