We’ve been successfully using AITasks and AbilityTasks internally for a long time (around 18 months), so I have resons to believe we have most of the bugs fixed already. Of course there are cases we haven’t encountered in our projects, and users in the wild will hit those. If you do we will fix them, or you can always flip the switch back - we’re just changing the default value, not taking the switch away.
One correction, the change will be in 4.15.