See here:

https://github.com/wildfly/wildfly-cekit-modules/blob/master/jboss/container/wildfly/launch/messaging/added/launch/messaging.sh#L1092

When this returns 1 (remoting not present):

https://github.com/wildfly/wildfly-cekit-modules/blob/master/jboss/container/wildfly/launch/messaging/added/launch/messaging.sh#L68

and once DISABLE_EMBEDDED_BROKER is set to always:

https://github.com/wildfly/wildfly-cekit-modules/blob/master/jboss/container/wildfly/launch/messaging/added/launch/messaging.sh#L949

Will fail and /subsystem=ee/service=default-bindings:undefine-attribute(name=jms-connection-factory) will be executed instead, of the expected /subsystem=ee/service=default-bindings:write-attribute(name=jms-connection-factory, value=\"${defaultJmsConnectionFactoryJndi}\")"