They lost because the bowlers couldn’t grab wickets and I have questions whether the team has genuine pace attack or not, for Instance - Mustafiz ceased to perform better in sporting wicket and Taskin's replacement was horrible.
Dont know when the tigers would get a quality leg spinner, and we dont need all rounding off spinner all the time.

The series loss was all due to complete failure of the players and team management, if they dont get out of the circle, the future would be uncertain.