There was a huge disconnect between management at the top and those on the ground.

I think some managers never learnt to correctly judge workload and responsibilities. They we're rewarding those with minor responsibilities for achieving goals and harshly punishing those with huge responsibilities for minor misses.

This inability to judge workload and responsibilities was previously hidden by people's presence in the office giving bad managers a proxy but now the flaws in that management style are being exposed in the most extreme way. Entire teams are disbanding since as soon as one member of an overworked and under-rewarded team leaves the problem for that team is exacerbated.