Hm, guess I should have framed my argument a little better.
I speak more in terms of mid-game. In early game, I view top lane as the best lane to gank early, especially for a snowball assassin. It's too early to control dragon if I don't have a particular champion, and I'll be paying attention to mid and bot for most of the mid game.
However, after that, I do expect the top laner to be able to handle themselves because I need to prioritize bot and mid in order to control dragon. If the top laner takes teleport, I expect them to help me out after I help them snowball. If they take ignite, I expect them to take control of their lane afterwards.
But I do stress that top lane, even Fiora, needs to be independent after a point. If they have teleport, that gives me better control over dragon pit if I help them, but otherwise I do need to pay slightly more attention to bot and mid.
Fiora can carry, yes, but so can a full item adc or mid laner. And the other two give me slightly more objective control. My best tip to you is to take teleport for dragon and teamfights, and to ask for a gank early and give your jungler a heads up so they can gank your lane first before setting up dragon.
After the first couple dragons or so, the jungler can probably gank your lane a bit more.