Well.. this is something that has happened in the past with teams like India as well. They prepare dustbowls against SENA teams, hoping that their spinners will be able to exterminate the opposition. Once in a while, spinners from the opposition side take advantage of this situation and in the end the tactic backfires on the sub-continental team. As such there is nothing wrong with these tactics from Bangladesh. If they had prepared good pitches, then in all probability New Zealand would have swept the series 2-0.
Does this also apply to Poms? They rolled over green pitch at lord etc and almost lost the series and had to settle with a draw series after one year.
Does this narrative also apply to Proteas? Remember the time, when they gave such a bouncy, paced pitch that their batters refused to bat on, kohli's team spanked them badly there despite losing a series.
SENA countries offering Green, Bouncy, Seam and talk would be around good/bad cricket, good/bad cricketers and skill/unskilled but everyone takes a U-turn when any subcontinent team prepares spin wickets. I hope you got the point.
In Test cricket, every team is going to prepare the pitch as they wish it to be. And most of the time they are going to prepare the tracks so that they have an advantage. That is going to be the story of almost every test match in every country.
I don't know why, for some reason, people are losing their minds over this. Because people should know that this is what they should expect. And the team touring another country also knows that very well and they should also be prepared accordingly.
