[mlyle]

But, my connection speed is usually greater and my loss is much less to my VPN endpoint than to whatever services I am accessing though that endpoint. As a result it doesn't affect things much. Further, accessing it with UDP is not always possible.

[lxgr]

> [...] my loss is much less [...]

Unless it's actually zero, any loss on the "outer" TCP stream will cause a retransmission, visible to the inner one as a sharp jump in latency of all data following the loss. Most TCP stacks don't handle that very well either.

[mlyle]

Sure, even when outer loss is pretty close to zero, it's conceptually not great.

On the other hand, I get 400mbps over TCP-over-TCP connections, and can't connect in any other reasonable way. 400mbps > 0.

Even tunneling in UDP is not great due to MTU effects.