A tonload of heroes can farm the hard camp with Iron Talons.
Enchantress & Lone Druid are so strong because they can sustain themselves on a lane even if the enemy tries to zone them.
I mean even the most ineffective tri lane can force out regular offlane heroes by just going after them, doesn't really work vs Enchantress or Lone Druid.
They're like Brood, you have to answer with specific heroes, if you don't have them they pretty much auto win the lane, except that LD & Ench have some real impact on the game with their advantage.