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This is a tired old generalisation trotted out by IT people every time the topic of MS Office comes up.
There is no such thing as a typical Office user, as it is a Swiss Army knife that does a lot of different things for different people. A standard tool has immense value in business though, which is why everyone keeps paying for it.
Multi day electricity outages haven't been a problem in developed countries since at least the 1980's. In the event of a catastrophic earthquake, gas would also go off.
Liquefied air storage is "efficient" because the discharge cycle uses ambient heat for vaporisation, which doesn't get considered in the electrical efficiency calculation. It isn't efficient in a closed (adiabatic) cycle, but the temperatures are such that ambient temperatures are always sufficient possible to vaporise air.
This is similar to how wind turbine and solar PV efficiency cannot exceed 40%; people don't care because the other energy doesn't count per se.
Anyone in Australia buying an EV already has solar panels. Peak loads on the grid are summer during the afternoon once solar drops off but temperatures are still high. Taking public transport to work is common, so plenty of EV's sit in the garage during the day.
Where did you get that figure from for pumped hydro? No large diameter valve can open in a tenth of a second, plus you have inertia as the turbine spins up.
The technology for redox flow batteries has been developed, but it isn't cost competitive with lithium ion. Sometimes a simple solution is the best one.
If you've been to Australia there are farms hundreds of kilometres from the nearest city. We just don't assume that their needs should dictate the transport infrastructure of the entire nation.