>>21026350Grass needs another type to hit SE rather than another resist. Sure it's tied with Rock for the most weaknesses, but it has some legitimately useful resists (Water and Ground).
Grass wants to have one or two of its NVEs to be neutral, and to lose a weakness.
As it is, it's the most resisted type (hello Gen 6 Bug, welcome to being Grass since Gen 2), and the type with the most weaknesses (with our friend, defensive Rock).
It isn't like Ice, where though it has major weaknesses, giving it several resists puts it on par with other types for resists/weak/strong/nve with a bias towards offensive stronghouse.