I guess this discrepancy perfectly illustrates the communication problem within Manjaro’s development team, and why we published the Manjaro 2.0 Manifesto; Philip does what he does, but he once again neglected to bring this up among the Team. 
Either way, if Philip is going to implement this because of his business associations, then it can only be done at the level of calamares, and by using the optional age field in systemd. And this in turn means that it won’t change anything for already existing Manjaro installations.