Some of that doesn't seem very recognisable to me (eg the supposed huge influence of individual bishops), and I wonder if it represents a particularly N American take on things.
I don't know if it is a North American thing. When I talk about increased power of individual bishops I am thinking of a few things. One is that bishops have in the past - and I am thinking here particularly before the rise of the power of the papacy - been more at the mercy of their flock. Bishops who taught incorrect doctrine were generally removed.
In the Anglican world bishops have been pretty much able to impose what they like on the laity, even if it is a substantial change from tradition, and they have not been subject to discipline from other bishops either. We have many bishops who teach things well outside of Anglican doctrine, but there never seems to have been any effort to remove them.
As far as what I think was a more recent example , I mentioned in another thread, I think when you were away, about the increase of administration and power around the office of bishops, and I gave my parish as an example, but it is typical. At one time the diocesan office was quite bare bones, including the bishop and a fairly minimal staff to help him do his job. Most of the assets of the diocese actually belonged to parishes. This is no longer the case - administratively there has been increasing centralization and the diocese now has a substantial staff. It also demands funds from parishes (where it used to disperse.) It has no official powers to do this - it enforces it's demands by refusing to appoint new rectors to parishes in arrears.
Additionally, in the newer prayer book in Canada (the BAS), the ordination service has rather stronger vows of obedience to the bishop as opposed to the Church, compared to the old one.
I tend to think that this kind of change in monetary and administrative power is often significant, even when it doesn't initially appear so.
My guess is that Anglicanism inherited a tendency to follow individual leaders or to give them too much power to interpret doctrine, from Rome.
I also wonder whether "when it went wrong" isn't liable to depend on what one sees as a wrong decision. For many the process surrounding ordination of women falls in the last big success, for others the first big disaster.
I would be interested to here some examples of big controversies that you think were appropriately resolved whenever you think the appropriate model was working.
Well, I don't really think the outcome is what makes the difference. More the evidence that it isn't actually working. I think that is pretty clear no matter what you think of the outcomes.
Big controversies? Well, what about all of the ecumenical councils? Since the Reformation? I'm not sure... I don't think I'd count the Elizabethan settlement. When I think of big controversies in Anglicanism, I don't think of a lot before the 20th century - Methodism, I guess, comes to mind.
As far as the 20th century ones - divorce, contraception, the ordination of women, and same-sex issues, have any of them been uniformly treated throughout the communion? Is there consensus on any of those things?