The Millet System was about managing religious minorities. What you are referring too, I think, was the Timar.
Yessir, that is correct.. I always get those mixed up
Hijaz was lightly controlled at best, but was very important for religious reasons and cannot be dispensed with. North Africa west of Egypt can be left alone I suppose, with a right POD, and possibly Hungary as well. Hungary was a big drain for the Ottomans.
I agree with this, though I don't see why Serbia, Croatia, Romania etc. are any more important, other than "if we have it, our enemies don't," particularly Austria and Russia, but that can be remedied with a sort of "independence protection decree" such as the Monroe doctrine.
EDIT: Quite important indeed if we're still running it on the Timer system, though.
The problem with Iran is double:
a) It's VERY prone to be a battlefield. Too large and mountainous for easy centralized control, too close to the Eurasian nomads sources. Not impossible, requires a lot of luck (even more than my Andalus I think).
b) The disruption the Mongols brough.
Avoid that, say the Khwarezmshahs manage to achieve almost Ottoman-like levels of stability and centralization and develop gunpowder early so to fend off the nomads long term. They have a chance.
A Khwarezm industrialization would be very interesting, but they would need to be powerful enough to defend to the last from both Russia and the Ottomans, who might of turned their heads eastward if they ever considered Persia a real threat.
They have been a bloody battlefield. Even if they weren't never successfully invaded in historical times (AFAIK) the attempted Mongol invasions brought a lot of disruption that ultimately led to the breakdown of central authority and ultimately the Sengoku mess.
It has been raised before in this thread the point that the lower population of Britain relative to Japan was somewhat an advantage for Britain, which I see quite likely.
Japan has less arable land with a denser population. However, if the Kamakura shogunate goes on, maybe you'd interesting developments.
In any TL regarding Japanese industrialization, Japan would have to be open to Western influence when it comes and get on board with a lot of the economic and scientific thinking, or perhaps if they get on the right track early enough, fuse their own ideas and theories to it.
Why is a Popeless church required? I mean, the second place to industrialize in Europe was Belgium.
I originally had this, but I realized that it wasn't a very strong argument. I think what I was getting at was that Britain was able to avoid a lot of the social and political strife caused by religion because of it's (relatively) liberal/homogeneous views on the topic. While France and Germany were torn apart by various religious wars and civil uprisings, England was able to avoid this for the most part, partially because it was an island, and partially because it had a relatively relaxed religious policy, as well as some other factors.
Didn't know that about Belgium though, that's an interesting fact! In what regards is industrialism assessed in that analysis?