Finding Fine Grained Reactive Programming

No matter the library: MobX, Vue, Ember, KnockoutJS, React, Solid, Svelte, etc.. All fine grained reactive systems are based around 2 primitives. They have different names in different libraries but there are always 2: a̶ ̶m̶a̶s̶t̶e̶r̶ ̶a̶n̶d̶ ̶a̶n̶ ̶a̶p̶p̶r̶e̶n̶t̶i̶c̶e̶, p̶e̶a̶n̶u̶t̶ ̶b̶u̶t̶t̶e̶r̶ ̶a̶n̶d̶ ̶j̶e̶l̶l̶y̶.... observables and computeds!