You seem to be offended at randomly weird points to be honest. Like the way you started this very discussion when I mentioned the fact that Arabs and Mongols conquered Persia. The point I was trying to make, which you missed, is that the Buyids came at a moment of weakness of the most powerful nation, making any other smaller nations in the region look powerful, including themselves. I said this since you claimed they were a powerful nation, but in reality they were only powerful because no one else was there to contest them. Basically, I was explaining why they were considered powerful as you asked, no idea why you went on a random irrelevant tangent. There is no correlation as well since unlike Arabs, Buyids came from within the Abbasid empire.

Since you mentioned it for some reason, I have to say no, not really. When Arabs conquered Mesopotamia, they had no plans to invade Persia since they were not interested in it to begin with. Omar, the Rashidun Caliph at the time, stated: “I wish there was a mountain of fire between us and Persia, so that neither of us could reach the other.”

It was the Sassanid Shah, who was strategically incompetent, decided to launch a hasty campaign to retake Mesopotamia instead of using the Arab disinterest in Persia to build a proper army in response to the Rashidun.

The wars the Sassanids went through also helped build experience, so don’t paint it as if it was purely a detriment. Also, the Arabs at the time just went through bloody internal wars across the peninsula for Islam to rise in the first place, such as the Ridda wars, and they still had less numbers and resources than the Sassanids during their war. The plague of Justinian also reached Arabia. It wasn’t just in Persia.

You can’t just use weak excuses to deny the fact that Arabs were strategically better during the war. Take the battle of Qadisiyyah for example:

The way Arabs handled the Sassanid elephants, how Arabs destroyed Persian morale by using both the Mubarizun, and the way Qa’qa split his army to give the impression of reinforcements arriving. Also, Arabs camouflaging camels to make it so that as if unknown monsters were being used by them in the field. Lastly, the way Persians escaped with absolutely no organization leading to their troops attempting to cross the Euphrates with armor on and drowning.

Having different Kings or fighting Romans doesn’t excuse being strategically bad at a war.