[Twan]

All Mighty/Random iirc (wanted them to be able to destroy the garrisons not too slow).

In fact, a big thing may change with human players : the plains may lose a lot of their income : AI don't use 200 tax for provinces they have big chances to lose. If the situation is chaotic enough in the plains with human players, many provinces will often be taxed at 200 and ruined by unrest, reducing the income advantage of central lands over seas.