I think that there is fundamental misunderstanding at work here. Like, going on about "but Silver does stuff" ignores elephant in the room - it doesn't matter if Silver is better than Flare(lol) or that it could have better advancement paths(ahahahahaha), no.
What matters is that on top of being perfectly serviceable EFB, Flare directly deals with every single thing that is an issue right now. Let's count them up, shall we:
- Being a Ranklet? Directly dealt with
- Healing Verse? Directly dealt with
- Letrizia's lifespan issues? Directly dealt with
- Not being able to fight with the likes of High Marshal? Directly dealt with
- Contest of primacy with Azure? Directly dealt with
- Don't want to pass on Pillars because we took another Evening EFB? Directly dealt with
- Decimation lowering age of our population and friends? Directly dealt with
- Wounds? Directly dealt with(assuming that it being superior to Ruling Ring counts for that, either way)
And more.
And that's it, really. It doesn't matter what kind of shiny Silver is because it doesn't offer the same kind of "solve all our current issues" button.