Part of it is ease of reading. Double spaces simplify things.
As for why manually add spaces on type writers… but not on computers? It’s simple. Fonts can be adaptive. You’ve got monospaced fonts like courtier knew that would show no difference in spacing unless you add a second space, or fonts like Calibri where the font’s spacing is… less fixed.
A (mechanical) type writer can’t adjust the font at will. It strikes the same spot on a page, in what is basically a grid. Same goes for printing press.
Part of it is ease of reading. Double spaces simplify things.
As for why manually add spaces on type writers… but not on computers? It’s simple. Fonts can be adaptive. You’ve got monospaced fonts like courtier knew that would show no difference in spacing unless you add a second space, or fonts like Calibri where the font’s spacing is… less fixed.
A (mechanical) type writer can’t adjust the font at will. It strikes the same spot on a page, in what is basically a grid. Same goes for printing press.