They have become stupid and useless.
Specially on certain maps where it's just the two buildings less than 15 blocks apart where grenades are pretty much mandatory for a tactical breach.
Stop ruining halo. It's been abused enough as it is.
Put the grenades back to the way they were. Not being able to use grenades within 10 blocks of a spawn is way way too far. Considdering the size of most of the maps and their design. I feel that aspect was not tested before implemented and it has ruined the fun that halo used to be.