I recall reading somewhere that the problem was that there was no fatigue or ageing information on composite construction and the FAA demanded a much higher build standard than for comparable alloy aircraft. This had the effect of increasing the gross weight of the aircraft and its subsequent failure to meet performance targets.
I believe the decision by Beech to recall what airframes they could and to scrap them was to avoid liability issues. I also thought they had scrapped the type certificate so it surprises me that there are still 5 of them flying.