But what do you do when, say, the Jalayirids split into three competing branches: one at Baghdad, one at Tabriz, and one at Sultaniyyah?It would be too confusing and go against the "purpose" of the tag
There's a reason why, towards the end of my stint at M&T, that we were moving towards removing all of those "dynastic" tags in favor of "regional" ones. What you're proposing (Ottomans remaining Ottomans no matter who rules them) wasn't a feature of EU4; it was a limitation.
In an ideal world we'd have CK2-style "regional name that is replaced with dynastic name under the right conditions" setup that can just be done in script to avoid all these problems.
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