Re: [whatwg/streams] Editorial changes to transferable streams explainer (#977)

> I was a little concerned that Transferable Streams would make it pretty easy to route data around the cross-origin restriction

It's equivalent in power to a MessageChannel, so it doesn't weaken any security guarantees.

> I do think the explainer needs to support a better use-case than the general "workers make things easier", or "delegation is good".

It is currently only an ergonomics win, although I hope to add optimisations in future exploiting the fact that the platform understands the semantics of the transfer. I think it opens up the benefits of offloading work to a larger audience, and that's where the end-user benefit comes from.

I will try to incorporate @MattiasBuelens's examples into the explainer.

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