The Innervate glyph thing is something that suffers from the same thing that Int or Spirit suffers from, which is to say you just grow out of the need to care about mana as time goes on and gear goes up. Perhaps at lower gearing levels? But then I didn't ever have to use it even in blues, really, as the gear-appropriate challenges shouldn't drain your mana severely either. I can accept needing it in 10mans if you lack Replenishment, but then really you've not built your raid properly. Blizzard expects you to have a source for replenishment similar to the way they expect you to bring tanks and healers. Its why a whopping 5 classes are able to bring the same buff (Yes I know frost mage is not PvE viable atm). The glyph isn't the solution, finding Replenishment is. I can only assume that if a resto druid is having mana problems, he isn't the only one.
The Regrowth glyph isn't mentioned because it was used to make Regrowth function as a spammable tank healing spell. But that was before the Nourish glyph was introduced. It serves that function better, and one doesn't need both.
My understanding is that the Glyph of HT/Naturalist combo is really only used in specialized cases - ToGC Anub, Naxx Immortal runs, etc. I would humbly suggest that as such you probably don't need to speak about it in a beginners guide. Or to mention them as a combo for special circumstances only.
Edit- Ket, the "soft cap" assumes Wrath of Air totem and Swift Retribution/Imp Moonkin Auras.