Certainly, as you know, the Council of Florence was an attempt at reconciliation between East and West. A small number of bishops from the Greek-speaking Church attended the meetings and eventually these bishops agreed to accept the propositions of Rome (namely, the Filioque and the Papal claims). And so, on paper, East and West was reunified. Almost as soon as these bishops returned home with the news, the overwhelming majority (I do not wish to say a consensus, as that is rarely ever the case, but it seems to have been more than enough to veto a Presidential decision in the United States) of Christian people of their lands, both lay and clergy, demanded the Council be revoked due to the above concessions. The bishops in question, however, did not seem to take much convincing to do so. As such, there is some speculation that there was a bit of coercion at the Council or that the Bishops were weak-minded or that the concessions were made to speed along discussion, or perhaps all three or none.
Regarding the stagnation in development: that occurred primarily after the Turkish conquest of Constantinople than after the Great Schism, although, excluding the heretics based in the East, Eastern Christianity seems to always have had a more conservative tendency than their Western contemporaries. (This is seen especially in the fact that the primary Orthodox Divine Liturgy is 1000 years older or so than the Tridentine Mass.) There does seem to be quite a bit of spiritual growth and development in Russia after the Turkish conquest, however, though this was eventually stemmed and eventually stopped after the Bolshevik Revolution. Whereas the developments in the West are primarily theological (and the devotions such as the Rosary take from those developments), the East is not devoid of development. Eastern development tends to be spiritual and devotional, rather than theological.
The whole history of the matter is far muddier than either the average devout Catholic or the average devout Orthodox are generally willing to admit.
I hope this helps!