It's interesting that they considered reintroducing functional errata (a terrible idea, IMO).
I think you mean terrifying.
Functional errata happens all the time. What they were batting around clearly seems to be the old school Power Level Errata. Like, the sort of solution they came up with to "save" standard in Urza block.
When I said Kaladesh was the second coming of Urza, I didn't realize the analogy would go so deep.