Answer
On tracks where IFS only supports one Pluggable Database per Container Database, there's no significant functional advantage from IFS's own perspective to using the multitenant architecture over a traditional single-instance database — IFS's documentation using a multitenant example doesn't itself constitute a recommendation to prefer it over single-instance. Multitenant architecture becomes more genuinely useful from an administrative standpoint once, or if, IFS ever supports multiple PDBs per CDB. In the meantime, some customers going live on a multitenant setup have found routine DBA tasks like backups, database cloning, and point-in-time refresh somewhat more complicated than on single-instance, though PDB-based database refresh specifically can offer real advantages once that workflow is understood.