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That's something I personally absolutely loved. Hunter's Mark and Swift Quiver as spells. It imbues every character with a sense of magic and wonder.
A martial practitioner can't produce overtly supernatural effects, such as rays of blinding radiance or shields of invisible magic force.
1) As @EmmatheExcrucian correctly pointed out, 4E is drawing from myth and legend as inspiration for martial heroes here. This is something other iterations of D&D fall pretty flat on, in my opinion.
2) There absolutely is a fictional basis for martial exploits in 4E and it ties into the larger Dawn War setting underlying the game.
3) There seems to be a common notion than anybody and everybody is using martial powers in 4E, whereas it truly is reserved for larger-than-life heroes. In other words, "martial" is *not* a synonym for "mundane".
Other stuff you talk about, ghost lantern, I can see how that's magical and wondrous, but why is shooting lots of arrows a magic spell? Like, thematically?