Help me understand the React selling point. Existing email sending software supports text and HTML because that's what email is. No email client out there supports JavaScript, virtual DOMs, event loops, SSR or any such fancy web technology.

Instead of hand-crafting an HTML template with

etc I'm supposed to use your custom React components (

---

...) which you will promptly compile down to the tags I mentioned above. So...what value am I getting out of React at all?

You get the comfort of using react components instead of fighting with HTML tables to make your emails look nice. I think it's awesome! It's analog to what ink[0] does with CLI outputs. Sure, you could write fancy CLI outputs in bash, but ink takes the pain out of it and makes it easy.

[0] https://github.com/vadimdemedes/ink