Explanation: While sieges always provide some amount of advantage to the defenders, usually this is in stalling, rather than destroying, a determined enemy. During the 16th and 17th century AD, however, the Ottoman Turks had adopted then-cutting-edge professionalized military units in the form of the Janissaries (infantry) and Sipahis (cavalry). This advantage in military organization could lead to some very stunning victories, especially against their somewhat hidebound perennial foe, Habsburg-ruled Austria, which still gathered troops on an ad-hoc, feudal basis.

no Polish-Lithuanian Commonwealth in the Belligerents list

Found your problem.

always gets to me that his name is basically "afficionado/addict"

The "tiryaki" nickname is said to originate from his addiction to coffee.

In modern turkish we still use this with that effect, "O sigarnın tiryakisidir" > "his addiction is cigarettes"

EDIT : Just to be clear, you wouldn't use tiryaki in the context of general negative addiction, there has to be some ongoing appreciation of the activity(not just substance), so you wouldn't say someone is/has a "Heroin Tiryakisi", but you could say someone has a "maket tiryakisi" (kit building habit)

No wonder Siphai's are OP in Age of Empires.