When having elytron subsystem with only defined property-realm and calling remove on the subsystem, it fails due unsatisfied dependencies [1]. The subsystem is created from scratch with no dependencies outside of the subsystem => it shouldn't fail to remove.
[1]
[standalone@localhost:9990 /] /subsystem=elytron:remove
{
"outcome" => "failed",
"failure-description" => "WFLYCTL0171: Removing services has lead to unsatisfied dependencies:
Service elytron.security-properties was depended upon by service org.wildfly.security.security-realm.elytron-security
Service elytron.core-service was depended upon by service org.wildfly.security.security-realm.elytron-security",
"rolled-back" => true
}