From A History of Iran: Empire of the Mind, by Michael Axworthy (Basic Books, 2016), Kindle Loc. 2728-37:
Militarily, the Safavid state probably reached its apogee under Shah Abbas the Great and Abbas II. But despite its classification with Ottoman Turkey and Moghul India as one of the Gunpowder Empires (by Marshall G. S. Hodgson), there is good reason to judge that the practices and structures of the Safavid Empire were transformed less by the introduction of gunpowder weapons than those other empires were. Cannon and muskets were present in Persian armies, but as add-ons to previous patterns of warfare rather than elements transforming the conduct of war, as they were elsewhere. The mounted tradition of Persian lance-and-bow warfare, harking back culturally to Ferdowsi, was resistant to the introduction of awkward and noisy firearms. Their cavalry usually outclassed that of their enemies, but Persians did not take to heavy cannon and the greater technical demands of siege warfare as the Ottomans and Moghuls did. The great distances, lack of navigable rivers, rugged terrain, and poor roads of the Iranian plateau did not favor the transport of heavy cannon. Most Iranian cities were either unwalled or were protected by crumbling walls that were centuries old—this at a time when huge, sophisticated, and highly expensive fortifications were being constructed in Europe and elsewhere to deal with the challenge of heavy cannon. Persia’s military revolution was left incomplete.