Besides, Timur didn't really conquer all those teritorries he controled. Most of them he simply raided, destroyed their armies, looted, took slaves (artisans and skilled craftsmen) and shipped the whole lot with him to Samarqand. The core of his state was and remained after his death, Transoxania, so far removed from our map that it would make no sense to include it. The rest of his empire consisted of his neighbours who were scared shitless of his armies. If we went for Timur's empire, we open a Pandora's box of problems - what about his eastern neigbours where do we put them? What about the Jalayarids whom he fought, what about Armenia etc.?
No, Timur is on the fringes of our world. To include him would demand a serious reworking of a lot of things and we simply do not have the resources to do that.
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