White Mage gained the more powerful regen spells a few months after the inception of the first tier Regen spell, and while I agree that this was unfortunate for Red Mage, the fact that the intervening time was rather short makes it difficult to compare White Mage's original takeover of regen from Red Mage to SCH's theft now. White Mage has had much longer period of mastery than Red Mage had, and Red Mage's possession of a single low potency spell could hardly be regarded as mastery at all. In addition, the spells themselves (and their capabilities and drawbacks) have been established for far longer. I would say that the two events are comparable, but not directly so; this also ignores the fact that SCH's exclusive possession of regen enhancements has a potentially very negative impact on regen for other jobs in future updates.

As an aside, I'd actually be fully in favour of Red Mage recieving the majority of the regen spell tiers in the future. I assume you're talking about White Mage "doing too much"? I would certainly not disagree with you - I'm a career White Mage and I completely disagree with our blatent theft of Addle from Red Mage. I also question the decision to give us access to Boost-XXX spells (which I will stress that I enjoy having, but have a thematic issue with). If White Mage is to lose aspects of its domain under the guise of it being able to do too much then I would much rather lose my newer "auxiliary" tools that don't directly contribute to party defence and restoration - which would make sense - than miss out on powerful enhancements to a line of spells that mesh directly with White Mage's role.

Conversely, if you were referring to SCH being able to do too much and needing a slap, I would rather obviously agree with you without reservation. :P

With regards to Phalanx, I would certainly consider Accession >> Phalanx as superior to Phalanx II (assuming similar levels of potency). Convenience and speed of application is a very significant consideration when assessing the relative value of two similar spells. A relevant example would be the White Mage specific one of Divine Benison for ailment removal spells, which does nothing to improve the spells themselves but makes them far more convienent and quick to use, and therefore more effective.