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Whilst yes that's true for it's optimum operating performance an Unvented cylinder at lower pressures and lower flow rates than this will still deliver decent performance, much better than a combi boiler.Just for your info an unvented needs a min of 3.5 bar and 20 lpm
For instance our Static Pressure is 2.5bar, i've never actually got round to measure the dynamic. But at this we get 18lpm at the large showerheads, and can run two rain head showers at once without much decrease in performance - more than what we would out of a combi.
So yeah it'd be ideal to have 3.5bar and 20lpm, however I don't think it's always essential. Many places round us can't even top their boilers up to 1.5bar the pressure is that poor! - and yes I agree in that situation a Unvented is pointless.