I wouldn’t say signals is coming from React. If anything React is the latest to the party and being dragged there reluctantly by where the tech community is going. They’ve mostly been resisting the movement towards signals because it undermines a lot of the arguments they have made for their virtual dom, synthetic event system, and rerender all the things dogma. Solidjs is much much more in the signals camp. Angular, Vue, Svelte, etc also recognize the need for this sort of reactivity.

React could be argued to have abandoned the fight for being the best client side framework technically (though they have dominance pragmatically). They are really all focused on Vercel’s Nextjs/SSR/SSG/RSC stuff in recent years