And EU4 Spain/Ottoman are unlikely to stagnate like their historical counterpart did. EU4 Spain/Ottoman won't become the sick men of Europe by the end of the game. EU4 Spain/Ottoman with its historical territory are most likely to snowball even further, if anything.
The problem is that "wide" empires, and conquests in general, are too good in EU4 (or, in any grand strategy games). The empires in the real world typically depended on their heartlands (say, Castile in case of Spain), and few "crown jewel" colonies/territories -- with everything else being buffer areas (or unreliable puppets/autonomous territories) at the best, or economic drain at the worst. With the benefit of conquests as it stands now, many historical empires are simply game breaking. Province autonomy is a good start, but is nowhere enough, if anything.
Of course, I don't think they will want to fix this problem, though -- people play grand strategy games to conquer, and will complain if their conquests don't yield benefits. Just see how many people are complaining about the province autonomy system...
The problem is that "wide" empires, and conquests in general, are too good in EU4 (or, in any grand strategy games). The empires in the real world typically depended on their heartlands (say, Castile in case of Spain), and few "crown jewel" colonies/territories -- with everything else being buffer areas (or unreliable puppets/autonomous territories) at the best, or economic drain at the worst. With the benefit of conquests as it stands now, many historical empires are simply game breaking. Province autonomy is a good start, but is nowhere enough, if anything.
Of course, I don't think they will want to fix this problem, though -- people play grand strategy games to conquer, and will complain if their conquests don't yield benefits. Just see how many people are complaining about the province autonomy system...