Great insights which are worth all the effort for a proper system, everytime! Some setup engineers refuse to go the long way because they just seem too lengthy a process and might even incur additional costs. This is really worrying regardless of the nature of the event that the system is being used at.
The more recent Fully Differential Amplifiers (FDA) offer both CFA and VFA versionsThe CFA based versions will also have poor DC accuracy while more recent “precision” VFA based FDAs can provide much improved DC accuracy. Those VFA-based FDAs do come with some added DC error sources beyond the typical op amp terms that will be described here