Note: This is purely in regards to FGO’s Epic of Remnant and not the Fate story at large whereby servants are often called by their class name.
With how antilcimactic or in-your-face the true names of both Caster of Midrash and Caster of Okeanos have been presented in Salem, I against have to ask what the hell the point of the true name system was from the start?
The only two cases where I can see a reasonable argument for their effect would be Archer of Shinjuku and Rider of Resistance, though both could have their identities easily deduced in my opinion either through their character, appearance, speech, or related characters that were involved in the same singularity.
It just seems… pointless, and given that they have seemingly decided to drop the system, I believe they realized such.
So, what am I missing here? If you are able to summon a unit, you should be able to know their name, identity, and NP, without having it locked away in content.