Norm,
Airbus mentions the 30 kts as a "maximum normal" speed, surely not as a "recommended" taxy speed!
From the FCOM (3.3.10)
"... the normal maximum taxi speed should be 30 knots in a straight line, 10 knots for a sharp turn..."
And quoting from FCOM (2.4.10) "Fluid Contaminated Runways"
Avoid high thrust settings.
When taxiing on slippery surfaces, stay well behind preceding aircraft.
Taxi at low speed. Note that antiskid does not operate at low taxi speeds.
On slippery taxiways during turns with large nose wheel steering angles, noise and vibration may result from the wheels slipping sideways. Keep speed as low as possible to make a smooth turn with minimum radius. Differential power may be needed.
--
As I see it, the responsibility is ours and finger-pointing to the manufacturer's procedures will do little to help.