So on the list if things that are completely ruining the core gameplay, everything that does super high damage and is homing on top of it really needs to be addressed.
The hex is not the only issue with this combination but its the most prevalent. (Theres other even stronger options for that but pssst)
If 1 guy in your group has the a good Hex mod in M3 Proving Grounds. The game is just over. You can go afk and come back after that 1 person has Hex spammed the entire Instance to death with 0 effort.
There are other grenade mods, especially legendaries, that desperately need buffs. Im thinking of the fastball here for example but also the red queen and most of the other legendary grenade mods tbh.
Homing and high damage shouldnt be a combination that is this spammable.
A grenade spammer.
Edit: Thanks to Gaidax for an accurate demonstration of using the Hex at Mayhem 3 against the most difficult faction in the game:
PS: My other thread was closed because LITERALLY 1 guy kept trolling the thread and kept baiting people - if there is a way to exclude certain individuals from posting please do tell.