Thanks @MatthewMachuca !
In the eventuality that you are not already doing so, I hope you will be able to talk with the Atlassian groups who are organizing the REST API v2 deprecation dates (here) to ensure that there is a consistent policy across potentially-siloed teams.
For example, I would love to see if “support for whiteboards/database in v2 will be available before v1 deprecation” could be written as “support for whiteboards/database in v2 will be available 6 months before v1 deprecation”.