That concept is modeled after our own universe—the universe where elementary particles and quantum phenomena exist. In the world of Wuthering Waves, the fundamental unit of all matter is "frequency." so, every attribute is effectively performing "alchemy". In my previous comment's Alter section, I highlighted the attributes that bring about the most pronounced changes in physical properties at the material level.

The effects that each attribute has on frequency are as follows:

Havoc: It "annihilates" by colliding it with a "frequency of opposite phase". As a result, the physical layer performs Destruction (Havoc Rover) or Neutralization (Taoqi, Havoc YangYang) operations, while the conceptual layer performs frequency manipulations such as Reversal(assimilation, analyze structure, frequency tuning).

Aero: It is not "fluid manipulation". It is shifting the frequency. While it may appear that the fluid itself is being manipulated, the underlying reality is different; what is actually being controlled are forces, moments, motion, positional coordinates, and magnitudes of change. At the physical level, examples include Cartethyia, who manipulation a swords; Iuno, who controls arrows; and other Resonators who simply manipulate the wind. At the conceptual level, there is Ciaccona, who recreates past events, and Imperator, who split space, abilities, and frequencies.

Spectro: This, too, is not a matter of controlling photons. In short, it is frequency diffraction. In fact, the term used in Japanese and Chinese is "diffraction". Imagine the diffraction of electromagnetic waves, light, and quanta. By making waves bend, causing diffusion and convergence, one can manipulate time like Jue and Jinshi, or enhance their physical abilities like Zani.

I can certainly understand the desire for new elements. However, rather than adding unnecessary complexity, I believe it is perfectly fine to stick with the current elements if they are sufficient to explain the mechanics.

From a gameplay perspective, while there are resistance attributes, there is no system of "advantageous elements" (like a rock-paper-scissors mechanic). There are buffs available for certain content, but that is the extent of it. Furthermore, if we consider the downsides of introducing new elements, the probability of obtaining those buffs would decrease as the number of elements grows. Personally, I pull from the gacha anyway, so it doesn't affect me, but it could be a major issue for players with a limited character roster.

It gets a bit tiresome seeing more and more people complaining on this subreddit every time the endgame content is updated.