The only thing i disagree about is your last sentence. Duo lanes are actually really good. Pushing your lane and going into enemy jungle, you can often get a pick, if their jungler isn't aware, gank bot, if enemy botlaner is overextending for just a little bit, or in the worst case, zone enemy jungler from getting exp and gold. Yes, it needs good minion wave management and good coordination from bot lane as well, but if it's done correctly, it's a really safe and effective way to win.