I agree. There's a rich ecosystem for building SPAs with MACH architecture. There’s no going back now, not even for basic apps.

For scale, this is the easiest approach. Teams can focus on their roles and specialize more, which leads to higher efficiency as team members build their rhythm and stay focused on what they're great at.

At my company, our React SPA uses just over 500+ components across maybe ~30 views, with many smaller components alongside many of them in the same files. Our bundle size is obscene, but our customers are using fast PCs on fast connections. Once it's cached, they're good -- and each new release is roughly every 2-4 weeks, so fresh visits are painless.

As for server-side rendering from RSC, Next, Nuxt, and SvelteKit, I'd say they're overkill in most situations. The amount of people deploying simple sites on Vercel using Next.js, not really using its features, is just silly (and costly).