What are the reasons of limiting the length of instruction queue in 8086 mp?

The length of the instruction queue in the 8086 microprocessor is limited primarily to manage complexity and ensure efficient execution. A shorter queue reduces the risk of delays caused by branch instructions, which may invalidate queued instructions. Additionally, limiting the queue size helps maintain control over the instruction fetch cycle, ensuring that the CPU can quickly process instructions while minimizing the overhead associated with managing a larger queue. Overall, this design choice balances performance with the microprocessor's architectural simplicity.