That’s like a batsman who has a habit of sometimes throwing his wicket away. If you believe the talent is there, you try and change those traits and get the best out of them. That’s why we have coaches.
That aside, does he even need to bowl 150 all the time - McGrath didn’t need it at that height and just kept it on a dime every time.
He can rip out his thommo type stuff now and then and keep em guessing
I’m surprised more quick bowlers don’t use fastballs as changeups. You only really see it from guys like Pollard and Bravo who bowl medium pace in t20 as their default
McGrath also could get the ball to swing and bowled in good areas. Billy’s only weapon ATM is his pace as he is gun barrel straight. He needs to add some strings to his bow
As a keeper he is behind 2 or 3, including Wade and Paine.
And as far as batting is concerned tassie has struggled to develop batting talent for some time now. Favourable bowling conditions probably doesn’t help.