Before I start I would like to explain why jahandad khan is a prime example; whenever you look at his batting or bowling, you clearly see he has talent his ability to hit sixes is amazing even as a scrawny guy and his pace and variation is decent especially for his action which I will talk about later on, however he has the most glaring issues ever . This archetype is literally a coaches dream .

With this youd expect him to be in the shaheens team ,especially when you count in the fact us not having an out and out pace all rounder is what seperated us from the best teams in the world this WC . But no he is no longer in the shaheens programme getting the development  and camps he needs instead he is not getting consistent games in domestic.

Regarding the issues he has , there are quite identifiable and have a fixed method to resolve

1.he obviously is too skinny and it is quite evident, it should be expected that his coaches both in Shaheen and domestic should've helped him bulk up or so , this has negatively affect his base when bowling and improving this could further help him become a big hitter

2.is his back bend and slowing down in the 2nd last step of his bowling action, if you look at him bowl in full motion you'll obviously see that he slows down before bowling costing a few kmh easily when bowling, this is due to the fact that he leans back way to early when bowling as shown in pic 1 his angle is already so behind when not even in his action.
To fix this he needs to learn back later on , and this should've easily addressed by a coach .

3. This interplays with the fact he excessively leans back but it's his ultra flat bent base on his back foot as shown in picture 2 , most of its cause is his extensive lean I previously mentioned but it's also due to his build his left collapse not just his feet(he should be in his tiptoes) 
This both reduces pace and causes back and hip  injuries yet he has remained the same for the last 2 years.
 His action is also made incongruous as he leans back yet has a complete side on action as he leans back early too this is usually ignored but poses problems in control length. 

4. This is much less significant but due to his slowing down, his front arm goes down way too early which affects both pace and length  his catapult like action is exaggerated and those batters who can pick goodish length will tonk him as he gets no skid even when being shortish , we saw it when Tim seifert tonked him NZ.

5. Now I want to talk about his batting a bit , his ability to hit sixes is superb especially with his still base alongside his great hip seperation as seen in pic 3. But the guy can't play in the offside for shit because he doesn't move his feet before establishing his base , another thing a coach should easily latch on to.

Whenever I see players like him get sidelined I always lose faith in Pakistani cricket , our awaam says "oh we have no talent" yet we do.
Our coaches kick players out yet don't help them develop. Whenever we give new players a chance they never play in position so it is just made as a way for a player to get no experience but backlash because the media expects every player , playing in bilateral to be the best 
 If someone truly believes our players will ever reach true potential you are ignorant and this will never happen until our system changes. If we ever win anything it is on complete talent not thorough thinking.

The mismanagement of jahandad khan is a supreme example of the incompetence in Pakistani cricket.