> Written characters and sounds don't usually correspond because pronunciation drifts very quickly in time
In space as well. Local accents can be quite variable. This alone dooms any “we should write words as we pronounce them” to fail unless every region has its own orthographic rules, which would be honestly terrible.
Phonemic / morphological spelling is a thing (or rather a range of things). E.g. Belarusian is spelled phonetically, but Russian spelling is closer to phonemic—while the Belarusian standard could be used to spell the Moscow variety of Russian pretty painlessly, for those of Vologda or Ryazan it would be a downgrade. (This does not stop standardized textbooks or tests from only touching on spelling mistakes that are natural in Moscow, but that’s another story.)
In space as well. Local accents can be quite variable. This alone dooms any “we should write words as we pronounce them” to fail unless every region has its own orthographic rules, which would be honestly terrible.