Exactly. So he’s not a luxury he’s inconsistent and unreliable and thoughtless. Umar gul with a lot less speed was quite effective, not to mention bumrah, shami, siraj, southee, boult etc.Rarely you will see a bowler in T20 Cricket that will get you wickets whenever you need and be economical.
He gets smashed because he goes for wickets and bowls in match turning phases. Sometimes it works. Sometimes it doesn't.