Hi Mitch,
You're right!
The thing is that now some Cloud Providers does not support "GRANT ALL PRIVILEGES" and "GRANT OPTION", so we recently changed our script to create users with limited privileges as you noted (GRANT SELECT,ALTER,UPDATE,INSERT,CREATE,DELETE,DROP,INDEX,REFERENCES). Also, newer MySQL/MariaDB versions have some changes on this matter.
Definitely, this is something we can improve, you can always change/update your user privileges manually according to your needs.