Your math isn't entirely wrong, but the angle you approached this from is different to mine. It's not so much about the number of casts in the fashion you spoke of but about fewer interruptions and more leeway with slightly faster casts/GCDs (animation locks, when it comes to Fey light) and so forth. Dodge-heavy content or content wherein mobs get repositioned as your cast is going out (leading to interruptions) - that 0.15s faster cast can help you finish a cast you wouldn't otherwise potentially finish. We all know those situations where you land a cast on the run at the last second, feeling out that cast bar before moving so that the cast will still be finished. You are also not accounting in for off-GCD ability-weaving with the shorter GCD you have. It's just about that fluidity.
Minmaxing in healing context is not the same it is for DPSing - you don't want to heal the most you can, if you can already keep up with what you have. That is in essence Selene's niche. No one likes overhealing. Hence, one of your priorities in Selene-able content is the overall fluidity and the maximizing of off-DPS times. I am not arguing that Selene is your go-to fairy for maximizing HPS (that would be retarded of me), but that she is not worthless at all in content wherein you don't need Eos. In such content where you can get by with Selene, you will have plenty of single-target healing power with Selene herself (as the Embrace-potencies are the same anyway) and you will likely have the time to throw in dots anyway, having Eos there would not change the status quo. That is exactly why I only argued for the usage of Selene in 'farm content', ie. stuff wherein you can keep up with Embraces (roused or otherwise) and the odd 'maintenance-lustrate' at best, when closing in on that aether-CD.
For curiousity value - I use Eos for: T5, Ifrit EX, Titan EX soloheals, Ultima HM soloheals and Garuda EX soloheals after the first add-phase, swiftcasting an Eos out during the first spiny plume (starting off with Selene). Selene for pretty much everything else unless the situation so calls for. (eg. swifting Eos out in the last phase of Titan EX if the other healer gets LS'd out or if shit is hitting the fan).

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