Comment by MaulingMonkey

Feature flags are great. Working on a crash / memory corruption in an optional subsystem? Just disable the subsystem to unblock coworkers on the same branch while you track down the cause.

Feature flags are terrible. Working on a crash / memory corruption in an optional subsystem? You disabled it previously for your local build, and you'll lose hours failing to repro despite QA giving excellent repro steps.

(For my own gamedev background, I learned to mute audio by setting volume to 0 instead of by disabling the audio subsystem.)