Yes, agreed.They were also extremely competent at a utilizing spies and avoiding potential catastrophes from what I've read.
Another answer [email protected] for the decline of the Roman & East Roman Empire's as a whole is that of taxes.
Simply put, there was a continuous problem in Old Rome and in Constantinople where the wealthy would corrupt, suborn, replace, co-opt the local tax collectors. Not to mention, whenever there was a palace coup the new emperor would reward his supporters with massive tax breaks.
This has a distinct analogue in modern times - the wealthy don't pay their fair share of taxes. The more they avoid taxes, the more the West declines, which is exactly what happened with Rome.