While TreeSync has gotten much better over time, but there are still so many who have errors and duplications.
What we users need is the ability to run a comparison utility that will determine and report the differences between the AMT and FTM. We could then determine what and where to fix the messed up data. We know our data better than any program could.
the ultimate would be to eventually have a utility that would present both records to us, and let us decide which to keep or edit as necessary. That may be a bigger challenge to do "online", but I can wish none the less.
Just my 2 cents worth.