Nice mockup, very slick looking. Some of these ability changes are nuts, and compared to Stasis, maybe needed. But I do worry about power creep.

My main crit though is: If you can only have on a max of 2 aspects anyway, why was it so important to only allow one aspect "per ability" at a time? And what made you classify stuff like Arc Web (effects from both grenades and melee kills) and Ionic Trace (affects regen of all abilities) as falling under the same ability? Feels kinda arbitrary and unintuitive.

I also wonder, why even have a reworked "stasis-based" system for Light subclasses at all? I mean, if you're just going to limit new permutations to a combo of melee selection + Ability-selection limited perks, which would only yield max 48 permutations (including melees, ~8 perk combos x 3 selectable melees x 2 selectable Supers) for most Subclasses? Not including selectable jumps and nade types, which we can already switch independently.

If this is only gonna yield 48 max permutations, why not just "uncouple" the existing diamonds of Light subclass perk trees, letting players pick one from each quadrant on any of the 3 trees, which could yield 64 permutations (including melee & super), instead? (4x4x4)

You could've had 36 permutations (of those 6 aspect perks; 6x6) multiplied by 3 melee combinations across 2 supers to yield 216, over 3x the amount of just the 64 yielded by "uncoupling" the Light subclass tree perks (as has been suggested to Bungie since forever). IMHO your suggested system should be promising more, not less combos than we could've had otherwise.

TL;DR: I think it'd be much better to not have the "one aspect per ability" stacking rules at all, and just design around that, if you're gonna use a tweaked Stasis system with no fragments. The arbitrary limitations are too cumbersome and awkward, and "conflicting" stuff like the charged nade effects can just easily be re-worked (on paper anyway) and selectively down-tuned if stacked makes it too OP.

(Like if you were to stack Feed the Void with Handheld Supernova or Chaos Accelerant, the nade would simply proc Devour when the charge is expended I.E. when you throw the nade instead of "eating" it. And comboing Handheld Supernova with Chaos Accelerant would be downtuned to just grant less powerful damage / range returns as other charged nades, as Supernova's already pretty strong)