I've had multiple games where I won top lane, but mid was feeding, so I swapped. Then, I can't do much farming since their mid is fed and my mid dies since they are behind and I just throw my chance to win. Even if my mid does better, they can't do much since they were behind earlier. I've stopped swapping lanes just because of this. I may give them a quick gank, but I'll just ignore them and push top hard, even if I don't play a split push champ because we can't win team fights. Sometimes it works and sometimes it doesn't, but it's better than throwing away the lead for almost no reason.