There is actually a lack of it, there is only connotative evidence here in one comment that refers to "hey look linkerd does this at scale" that sounds nice, except that is not necessarily the point or the case.
How is having side-loaded proxies _better_ or more beneficial than having it separate? It doesn't appear to be discussed or mentioned in this thread, all of the arguments made for doing so are equally applicable to the separation of the proxy.
