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if the hardware landscape settles for a while (in terms of the capabilities of devices and networks - which is not a crazy precondition given Moore's law has run its course) then it may be that these server/client pendulum oscillations get damped around an "optimum" of sorts.

An optimum defined both in terms of what it enables users to do with software but also how easy it is for developers to deliver it. Since simple is better than complex it feels that any architecture that does not require two distinct ecosystems might have an advantage (all else being equal).