E2e places the cost of interoperability on the ends, where it belongs.
The basic principle (it's NOT an argument) is that functions should go where
they most efficiently belong.
Yes. I think that's a fine restatement in terms of architectural optimisation.
Personally I prefer to think about this in terms of costs, because it's all too
easy to conflate "efficient" with "cost effective". There is often a
correlation, but not always, and of course it is the latter that actually
drives procurement and so deployment.
(The actor bearing the cost isn't necessarily the one performing the
architectural function. I pay my ISP to run BGP; in principal I could make
alternative arrangements myself that could yield greater efficiency, but it
would be wildly less cost effective).
A corollary to this is that designing successfully for systemic efficiency is
really hard if you don't understand how the costs will be bourn throughout the
system.
Josh.
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