My take is that they could not manage the team growth that was supposed to support their business growth. When team was relatively small they could execute well

My take is that they could not manage the team growth that was supposed to support their business growth. When team was relatively small they could execute well. After they grew and had to hire just to fill those new positions random people dragged them down. The quality of late BB OS6 and 7 was awful compared to the 5th. This all happened when they were making good sales and were still growing.