You don’t need 20 points in Air for perma swiftness. There are several ways to get it otherwise … Combofinisher into static field + air-4 with staff + boon duration -> perma swiftnes. Same goes for D/D with Air I-Trait and air-5 (and maybe switch to staff or fokus for more auras). You don’t even need to use the heal glyph. Elemental Attunement also always included
that aside i agree with you that those traits (at least Windborne Dagger and One with Air) are completely useless.