I have a question out of curiosity.
Why has the player in the safe lane farming been regarded as the hard carry and the midlaner regarded as the "secondary carry".
The player in mid has solo exp + farm, while the safe laner is usually laning with a support that will sap a percentage of the exp.
Genuinely curious how this setup got started.
I believe it's because mid is more susceptible to ganks from supports. The midlaner typically values levels over items, whereas the hard carry values items first. So mid gets solo exp and safe lane is easier to get last hits.
That said, its not too uncommon for the main carry to be placed in mid these days. EG do that a lot as Arteezy is so good at farming and sensing ganks, and heroes like Naga are played mid but are definitely the 1 role.