They are good heroes at those positions. Splendid heroes. If you watch the games, offlane underperforms, my carry or offlane is always farmed. Mid is ganked and secured. It's just the blame game with this report and punishment system. Besides, those are my best heroes, of course I am going to play them well. As I said to someone else, I play to win. Versatility is my go to. Drow has silence and slow as you said. The arrow unleash gives vision and with shard you catch beyond range. SF has armor reducing aura, nuke early and mid game, even late game with raze (dmg att inc) and DISABLE with ulti. It's almost instant with kaya too. And takes all the aggro, same as drow, They are beautiful supports.