What consequences can arise from using a single global queue for separate task threads?

Using a single global queue for separate task threads in iOS can lead to several problems:

• Blocking and delays: If all tasks are placed in one queue, tasks that could be executed in parallel will be executed sequentially, reducing performance.
• Task priorities: Different tasks may have different priorities, but in one queue, they will be processed in the order they arrive, which can lead to delays for important tasks.
• Debugging complexity: It is harder to understand which task causes a delay or error if everything is mixed in one queue.

Therefore, in iOS, it is common to use multiple queues (for example, global parallel and serial queues) to efficiently distribute tasks and manage their execution.