Most tectonic plates only move at a speed of around 1.5 cm/year, but during its collision course with Eurasia India moved at around 15 cm/year! By tectonic standards that is fast.
We only have a few years of data and are trying to apply that over all of history. We don’t know how fast they were moving before we realized the plates even existed. For all we know, those goofy shorelines on medieval maps could be accurate.
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