However, in T20s, the United Arab Emirates is much weaker than Bangladesh, so Bangladesh will benefit from its weakness.
Now you should say that Bangladesh is weaker than any other team in T20 format. They have lost the second match against UAE, which is a big shame for them. Bangladesh isn't playing with a weak squad there. The presence of Mustafizur would have made some differences. Still, it is a big shame for Bangladesh to lose the match after giving a target of 200+ runs.
T20 format can be unpredictable. If you remember, back in 2014 Bangladesh lost to Hong Kong during World T20. And this is not an isolated incident. In T20 cricket, it is not rare to see minnows winning against relatively stronger teams. But despite all these wins, the ICC usually ignores the underdogs and fail to provide them with further opportunities. And in this example, Hong Kong is no longer considered as one of the stronger associate sides from Asia. For the United Arab Emirates, the advantage is that they have systematic support from the ICC, and also they are one of the richest associate boards.