The thing is, while I get that it might appear to make sense to theme these subclasses around existing tools and tactics of the Eliksni (like using shanks and servitors, or blink, etc), use of the Traveler's light means that abilities far outside of what Eliksni could do are now on the table, so it's restrictive to limit the powers to just what existing Eliksni have been able to do. A "regular" guardian's radiance, hammers of sol, wall of light, stormtrance, or nova bomb was never based on some existing human/exo/awoken abilities and technologies, so why should an Eliksni guardians's abilities be based on existing Eliksni tech and abilities?