In the migration I was a part of (probably one of the larger ones, period), I think something like 90% of code could be migrated by automation. And of the remai

In the migration I was a part of (probably one of the larger ones, period), I think something like 90% of code could be migrated by automation. And of the remaining 10, most of it needed only trivial human oversight. That remaining two percent had a lot of painful things (truly, I have some stories), but "the overwhelming number of use cases" was trivial.