That cleaner foundation is shared-nothing linking, capability-based security, virtualizable APIs, and more, and a WASI organized around things like streams as first-class types.
The goal is to build a new platform. Initially, that looks like adding layers on top of existing platforms (which, as you say, already have multiple layers). If we succeed, then we get to start taking out some of the layers.
The goal is to build a new platform. Initially, that looks like adding layers on top of existing platforms (which, as you say, already have multiple layers). If we succeed, then we get to start taking out some of the layers.