Why remove auto sweet spots for tether recoveries? That really puts the screws to Olimar, Ivysaur, and Zero Suit Samus.
Personally, I think it should be easier to fight for edge grabs, especially with characters that completely rely on tethers. Then again, I think edgehogging is one of the cheapest things ever, and the hallmark of a true *sshole.
I always thought a system where teammates could grab each other's feet to aid in recovery would be fun, too. Like, if your teammate was just out of range of the stage, you could grab the edge, then they could grab your feet (tethers, too).
That seems like it could be complicated, but I think it would be neat.