You are making it sound like Satner, Zampa, Maharaj, Aadil Rashid, Rashid, Nabi, Bracewell, etc. didn't do anything on Pakistan's decks. Pakistan also went with one spin attack on Dubai, so it's not like they were banking on spinners despite knowing Dubai's condition. For a decade or so, Dubai was a home ground for the Pakistani team.
If Agha is coming as a specialist skipper, then it's alright but his batting credentials don't justify his inclusion in the squad.
PCB for some reasons is preparing batting tracks for so many years where spinners nor pacers were finding any support. Just look at scorecard of England vs Afghanistan and New Zealand vs Pakistan matches. For Dubai, Pakistan must have done the necessary home work and should have included Noman Ali and Sajjad Khan in playing XI.
Salman Ali may not be an ideal candidate for captaincy but who else to chose? Babar, Rizwan already tested as Captain and they are dropped due to poor performance. It's time to give new comers chance, with time they will learn and may be Pakistan can finally find the right playing XI.