As someone who's been using the Rend3/WGPU/Vulkan stack for over three years, I'd like to see some of these renderer projects ship something close to a finished product. We have too many half-finished back ends. I encourage people who want to write engines to get behind one of the existing projects and push.
Which is quite different than a renderer that targets wasm/webgpu. I think super highly of, and have used wgpu a fair amount.
I just interpreted Renderlet to have different goals.
On the "backend", we will switch fully to wgpu as we retool around wasi-webgpu. I explicitly don't want to rebuild a project like wgpu, and everybody should commit upstream to that - we will likely have stuff to upstream as well.