I agree with you that Pakistan has performed quite well, and scoring 171 runs in the T20I is a very strong team's target.
Pakistan had given a decent target today. It wasn't a big target which could be addressed as
a very strong team's target. Especially when they are playing against a weak team like UAE. Pakistan and Afghanistan will play in the final of this tri-series. I hope it will be a competitive match. UAE hasn't won any matches in this series yet. They have only one match left, and I believe they will lose it for sure.
The United Arab Emirates team is mostly comprised of rejects from India and Pakistan. So you can't expect them to perform well against the established teams. The Emirates Cricket Board has a lot of money, and this enables them to import players from the sub-continent. But despite this money power, they have performed poorly when compared to other associate nations such as Netherlands and Namibia. The only positive for them during today's match as Alishan Sharafu's innings of 68.