Current global snapshot: Tier A, 51.91% win rate, 0.75% pick rate, 0.09% ban rate.
Butterfly is a reset jungler. She does not need a long fight to look good; she needs one target to fall, then her cooldown reset turns the fight into a second kill. The mistake is jumping in first just because ultimate is available. A good Butterfly player waits for health bars to drop, enters from fog, and uses the first takedown to snowball the fight instead of forcing a 1v5 highlight.