I've been a fan of his left arm fast bowling ever since he has made his debut for Pakistan. He had shown extra-ordinary potential since this debut. However, following his comeback from injury since late 2022, he seemed to have lost his potency as a bowler. His pace has dropped significantly and so his wicket taking ability. He is also becoming more predictable and batsmen are increasingly aware of his lengths and they're exploiting the same.
However since his drop in performance as a fast bowler, he has shown increasing interest and improvement in his batting, particularly in league cricket and he has been promoting himself in his franchise team as a middle order batter. He has delivered some match winning performances with the bat something we associate with Ben Stokes and his flamboyant batting in shorter versions.
Fast bowling is a tough job and it seems Shaheen has realized this. He is trying to re-invent himself as a cricketer and exploring ways to extend his cricketing career. He being the captain of the international team will also give him the leverage/ liberty to experiment with his position in the team and make certain calls in his / team's interests.
Though he is ONLY delivering with the bat in franchise cricket and needs to replicate/ realize his potential as a bowling all-rounder in international cricket, his intent suggests that he has given up on his ability to deliver as a specialist bowler and is looking for avenues to shine as an all rounder (which will give an opportunity for him to be picked as a batter in case selectors lose faith in him as a bowler, something Ben Stokes has been doing for the past few seasons).
Do you see him shining as an all rounder and if it pans out play out as a specialist batter in the shortest format and then may be take it to test cricket ? This will maximize his returns as a cricketer and will prolong his international career.