Hi Lynn
What you say makes logical sense (DEV has more features than Standard) but the official Microsoft documentation says dev to standard is a valid upgrade path!

See the section SQL Server 2016 Edition Upgrade section in this doc:
https://docs.microsoft.com/en-us/sql/database-engine/install-windows/supported-version-and-edition-upgrades

??

I will post on the MSDN forum as well - let Microsoft answer for themselves 🙂

Thanks
Neile