[rich_harris]

ISR _can't_ be implemented at a framework level without tying the framework to the platform. The fact that we instead chose to implement it via a platform-agnostic adapter API surely demonstrates the opposite of what you're implying

[0xblinq]

This would be true if you also provided an adapter-node, which would work on most traditional servers, and most non-serverless platforms.

The fact that you prioritize the vercel one and not the node native one proves what OP implies in my opinion.

[byyll]

It's platform agnostic but Vercel is the only one that supports it? At least that's in the docs I linked.