It appears as though people aren't opposed to Anam being included because he's not ready, but out of fear that he will somehow fail. If its the former, than people need to have their heads examined! Anam has a very un-Bangladeshi habit of hitting hundreds at every level he's played in. I have no qualms of keeping Anam in every A team tour for the next 4 years, so long as he's also playing in every Test. We don't play enough Tests to worry about burn out and neither does he bowl or keep wicket at the highest level.
To reiterate, Tamim was drafted into the side based purely on potential and 2 sixes he hit against a woeful Zimbabwe team. That was it, thats the whole reason he was picked. He didn't turn out too badly.
Did Nasir even have any FC or List A hundreds before he made his debut?
Anam has hit 5 FC hundreds already, 3 hundreds in YODIs, has a YTest MoM award, led a YWC in run scoring, has hit hundreds in the DPL, had a 169 vs a RSA Academy side where every bowler had first class exposure, has scored runs in foreign conditions, has batted up the order and in tough situations. Contrary to needing more "seasoning" as if he's mere meat, never has a Bangladeshi teenager been MORE ready for the national team! No one has a guarantee of preparedness, but this is as close as you can ever get.