For example we could flow tomato paste through wires and the flow would generate energy instead. Why does everything come down to flow of electrons.
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Hydraulic is a lot better for most high power work: compressed air or oil to run systems. Better cooling, lower maintenance, and some systems may last from 10 to 200 years with no maintenance. Electric motors can’t live that much, need cooling, weigh 3-10 times more, and can just rotate; while hydraulic machines include a lot more applications like pull/push/hold and spin things up to the speed of sound.
Also in hydraulic the control of power speed position and force is incredibly easy to do, cheap and reliable.
Electricity is king only in logic work. This is because electric circuits can be made cheaply to very very small size. A mechanical calculator is around 1 foot by one foot by half foot in dimension, and it just does basic math like + – * / and very limited number length. For the same size you get approximately a million chips that can do the same and better.
The only heavy job that electricity is better than hydraulic are: to transfer power to very long distances; to move trains/tram on prepared tracks.
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