Perhaps it's because Zodiark and Hydaelyn are dead now, and the End Of Days came and past. Remember, Zodiark and Hydaelyn (or just Zodiark), created and maintained a "shield" of Eather around The Source and all it's shards. The shield stopped, or at least severely stifled Dynamis's effect on people. Hence why the delay of The End Of Days back in the Acsians time. Now that the shield is gone, we may be seeing an effect of that. That effect being there are now more "special people" who are more attuned to Dynamis than others. Perhaps now, more than just the WoL and and few choice others are able to tap into Dynamis. We're not so "super special" anymore, others are on the rise now as well. Plsu, The End Of Days happened, perhaps there are people who were on the verge of turning into monsters. Dynamis swelled in their bodies, and they came close, but we stopped the End Of Days just in time. Now however, their bodies after getting so close to turning, are more "attuned to" and can channel Dynamis more easily.

I see Bakool Ja Ja and Zoraal Ja being cited, and perhaps they just weren't able to tap into Dynamis like Wuk Lemat is able to. She's special and can, they can not. Not to say they are weak, they are powerful in their own right, they just can't tap into Dynamis like she can. Dynamis makes perfect sense in my head from a Lore Wise perspective, and the reason why Wuk Lemat can channel it better after getting her resolve boosted by the events of Dawntrail. Now that's not to say we're being sidelined as a WoL. We're still far more powerful, because remember, we have more than one extra part of our Ancient's soul fragments within us. We are Ayzema, with more "shards" of our Ancient's soul. We also have his crystal.

We're still the most powerful "main character", we're just starting to meet other powerful people.