Update - November 19: Witherhoard has been re-enabled as of today's patch. Huzzah!
Many Guardians were surprised to find their Destiny 2 Witherhoard disabled following a recent hotfix, but it turns out there was a good reason for the emergency change.
The official Bungie help Twitter confirmed that Witherhoard was disabled "until further notice" around 10pm on Wednesday, November 11. However, Bungie didn't specify its exact reasoning in this tweet. But if you've been in the Crucible lately, you probably already know the reason why Witherhoard was disabled: it was melting everyone in sight.
Due to an issue, we have disabled the Witherhoard Exotic Grenade Launcher until further notice.November 12, 2020
Granted, Witherhoard always does that, but due to a bug it was killing Guardians in the Crucible way too fast. It went from damage-over-time to instant death, which isn't ideal for a PvP environment, even one filled with wildly uneven Stasis abilities. Ironically, something similar happened to Witherhoard when it was first released, only its bugged insta-kill applied to bosses rather than players. Somewhere, the Sanctified Mind is smiling in its interdimensional grave as we suffer the same buggy fate.
This isn't the first time Bungie's disabled an Exotic (and as long as Telesto exists it surely won't be the last), and fortunately these sorts of issues generally don't take too long to fix. At the latest, we'd estimate that Witherhoard will be re-enabled on Tuesday, November 17 with the weekly reset. That's just our guess though; Witherhoard could return much sooner through a hotfix, so stay tuned to the Bungie help Twitter for official updates. When we know more, you'll know more. For now, you'll need to find something else for your kinetic slot.