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The excuse being given is that they wanted to give chances to a few youngsters before the squad for T20 world cup is announced. But if backfired on them. There is no issue in giving chances to younger players, but that doesn't mean that they should be used as cannon fodder.
Giving opportunities for youngsters is well and good but first they need to give the platform to perform in their home ground and not sending them to spin friendly tracks and hamper their confidence.
One thing that surprises me is that hardly any of the visiting teams are playing warmup matches nowadays. Is this due to COVID restrictions? It takes some time for the players to get adjusted to the conditions, and for that warmup matches are required.
The big players are opting out of touring some countries is because of the strict protocol they need to follow and it is not easy for the board to conduct warm up matches in these scenario.
Bangladesh got a taste of their own medicine for preparing spin friendly wickets when New Zealand had two spinners in their playing eleven and they took majority of the wickets

. New Zealand set a moderate target and Bangladesh struggled against New Zealand spinners, this is what we call a turn around

.
The failure of Bangladesh's first-class batsmen in the third T20 match does not confirm Handet Parsen as the reason for the match loss for the spinner wicket. Bangladesh is fairly He bowled well and kept 128 runs. It was not very difficult to target this run for the victory of Bangladesh but the first class batsmen did not show good quality.