We use a lot of React at Shopify on top of Rails, along with Go and Rust for critical performance systems on the backend.

Makes sense. Ruby dev over at Meta who uses Vue, TS, Rust WASM, and Rust backend at home. No Go (anymore) or Rails, but I love Rails, DRY-rb, trailblazer, haml for their expressiveness and software engineering.

Shopify has a nice GraphQL API that can be used to build JS frontends: https://github.com/Shopify/quilt/tree/main/packages/react-gr...

I imagine that paired with Remix it'd be easy and fun to build shops. It doesn't have to replace rails in that regard.

Probably not, but going where the market is in terms of business. Majority of their headless support is for react so investing in the stack allows them to expand and dictate that future. (Ancedata: did headless Shopify with ember and was aggravated in how piss poor their js support was in relation to React until their dev team told the data).

This is something I'd like to know as well and nobody is talking about it, weird.

Remember the whining people don't take action .. but the guys who have been silent all along quit .. suddenly shocking everyone? They will keep saying everything is going great!

Amen!