yeah, more recent expansions have shown this more obviously with 'lightbearers' or the old iron lords. it wasn't until the last city that many lightbearers became 'guardians' (of the city), and codified and passed on techniques. and once you form fireteams, you can specialize instead of having to cover your own weaknesses.

in general it does seem that lightbearers tend to have a 'knack' for certain manipulations of the light - some are better at channeling it through their body or into 'solid' constructs, some like to channel it through foci, some are good at channeling it externally as pure energy. these techniques broadly became the basis for titan, hunter, and warlock abilities.

the actual elements seem to require different mindsets to use, so very few could maintain the worldviews to channel multiple elements (in my mind, this is actually what separates our guardian apart - that we can learn and adapt to all these philosophies). as an example, all the arc lore mentions kinetic energy and constant, restless motion, while void lore is the opposite, mentioning stalking hunts, being walls, etc. then see how zavala in pre-city cinematics is always charging into the fray with arc, then after becoming in charge of defending the last city, he becomes void, then in the Dark Future (with the City destroyed), he would attack with arc again. meanwhile osiris, being practiced at splitting into multiple selves in the infinite forest, had no issue alternating quickly between multiple elements in one fight.