We're currently running a Galera cluster of 3 DB nodes. The way we're set up (due to ORM and automagical locking), we only have one of the 3 DB nodes being written to, and the other two provisioned for reads.
Galera's set to auto_increment on a value of 3, since there are three nodes in the cluster, in order to ensure that auto_increment values across the cluster are always unique. See this article (this is a Galera default) - https://blog.mariadb.org/auto-increments-in-galera/
If we plan to always only have 1 write DB, would it be dangerous or risky to set auto_increment to 1 globally across the cluster?