I won’t argue the virtues of postponing baptism to adulthood, as I personally don’t support that position, but was only using it as an example of an ancient tradition that was changed for the benefit of the faithful (even though not universal, it was so common that at least in some places it could safely be called a small-T tradition). But I will say that I don’t think the primary reason for postponing baptism, at least in general, was to allow people to have more sins forgiven at baptism. I think we have to give St Ambrose (who wasn’t even baptised when he was elected bishop) et al the benefit of the doubt, unless there is evidence to the contrary.
But I digress – I was trying to make a larger point about changing ancient small-T traditions (or practices). Perhaps the Orthodox view is that none of the ancient traditions should be changed, or at least that the standard for changing an ancient practice should be so very high that there are very few cases when such a change would occur. And perhaps that is the proper disposition for Orthodox and Eastern Catholics, based on their unique history and experiences (I’m particularly mindful of the iconoclast heresy in this respect).
But is it not also possible to admit–even from an Orthodox perspective–the possibility that for the Latin church the legitimate standard may be lower? Many of our changes have been to counteract heresy or otherwise to develop the faith of of our people. Is it not possible that–after weighing all the facts–the bishops of the Latin church made a decision in good faith to change the order of the reception of the sacraments, because they genuinely believed this would help their people better appreciate the mysteries, become closer to God, become more attached to their church, and generally lead more people to salvation through Christ?
I am not taking a position on whether the Latin bishops were or are correct in their assessment, nor which order of the sacraments is proper; rather I am only making an argument that it may be appropriate to change the order if a genuine need or great benefit arises from it. This may not be the approach the Orthodox and Eastern Catholic traditions take, but do you disagree that it may be a completely valid approach for the Latin church–or any sui iuris church?