Will switching to Hyvä help my SEO?

Yes, indirectly but measurably. Hyvä gives you Lighthouse 95+ and green Core Web Vitals out of the box, which Google has confirmed as ranking signals. Stores migrating from Luma to Hyvä typically see LCP drop from 4s to under 1.5s, CLS from 0.3 to 0, and Lighthouse SEO score jump from ~80 to ~95. That moves rankings on competitive keywords by 1-3 positions on average. But Hyvä alone doesn’t add structured data, fix hreflang, or generate llms.txt, those are separate work. Hyvä is necessary; not sufficient.