With time UAE will develop and improve too this is a gradual process, west indies is an old and experienced team and they have been on top of charts some years ago. Still they have some world best players playing in different leagues.
The amazing West Indies 3 match winning streak demonstrates their exceptional talent and cohesiveness as a team. Even though UAE had difficulties particularly with their batting and lack of experience there is still room for development. Even though the UAE bowling effort wasn't as good as it could have been the team can still learn a lot from it. West Indies once again demonstrated their superiority although UAE can improve their prospects if they gain more field experience and concentrate on keeping wickets in hand. UAE has the capacity to score a lot of points and make the match a thrilling closely fought match with a tactical approach.
I think there is nothing surprising here. Because the West Indies cricket team plays much better than before. West Indies cricket team has many experienced and talented players. I would say it was not a difficult task for the West Indies cricket team to win three consecutive matches against the UAE. UAE have not scored 250+ runs in any match in this ODI format. On the other hand strong team West Indies have the ability to score 300+ runs. But I think even if UAE-UAE can't win a single match in this series, they might have gained some experience from West Indies.