For me the major disappointment is how these guys weren't able to seize the key moments like in the 1st test when we were 100-1 and in the 3rd test when we had reduced them to like 90-5.
But isn't that part of a good/decent developing side? Azam, Shan, Imam, Afridi, Abbas all had less than 10 Test each IIRC and played relatively well. Played with rookies yet managed to find themselves in decent if not winning positions.
To put things in perspective SA sent an experienced side to Lanka (decline/transition or not) and didn't even win a session. Pakistan won a few sessions and scored runs against a quality bowling unit. This SA pace attack is the best we've had as a unit since readmission, so Pakistan competed really well imo.
The only concern I have is whether or not these guys can develop, talent is there it's not even an issue. But can the PCB produce a conducive environment for players to grow? That's my only concern (I don't trust them tbh), been a while since I've seen Pakistan play the same side over a long period without chopping and changing. Moyo, YK, Misbah were all kicked out of the side for non cricket reasons at some stage in their respective careers. That's just not conducive for development.
Persist and persevere with the current crop of youngsters and see where that leads you guys. Good luck.
PS: Obviously Pakistan has to find a way of touring SENA countries frequently. If not, go back to England as a neutral venue I hope the PCB didn't completely burn its bridges with the ECB. (A side can't develop on it's own you need a network of friends and allies, even South Africa got help from India then played the likes of Australia and England regularly in the 90's. So public relations are as important in player development. If you're not getting invited in these countries regularly, this includes A tours, then there's little scope for growth. Point being it takes more than just fixing your domestic structures to compete at the highest level. The PCB has to work on its PR) This post is longer than I wanted it to be, sorry.