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why it has taken 60 or more years for us to implement this into mainstream cars
Because mainstream cars need range - or, at least, their users think they do - and historically battery / electric systems couldn't deliver this as efficiently as ICE motors could for various boring historical reasons, whilst populations generally weren't aware of, or didn't care about, air quality.
Howard
It occurred to me yesterday that since I can remember, milk floats were always electric so I figured they must have been made at least 25 years ago. I've just looked it up and they began to become mainstream in the 40s*!
I understand they would have had low speed and small ranges but can anyone explain to me why it has taken 60 or more years for us to implement this into mainstream cars when seemingly we could have had electric vehicles in urban environments decades ago?
*electric vehicles apparently have been produced for commercial uses since the 1900s