The reason that justifies the decision to separate out proxies for gold tier and silver/bronze tier is that gold tier virtual machines run frequently and should not share resources with lower priority virtual machines. This is because gold tier virtual machines have a high RPO of one hour or less, which means that they need to run backup jobs more often than silver/bronze tier virtual machines. Therefore, they should have dedicated proxies that can process their data without competing with other backup jobs for proxy resources. This can improve backup performance, reliability, and scalability for gold tier virtual machines.