>>51852181Grass also lost its niche of the only type 4x SE against water/ground with the introduction of freeze-dry.
Also random Sap Sippers are immune to grass, while Bug at least has no abilities that nullify it (Shedinja is immune to both but it's a special case) and STAB on U-Turn.
Rock is weak to 5 types so you don't need grass specifically for that.
Offensively it might well be THE worst type.