I wonder how this works for logographic systems like Chinese, where the letter tells you nothing about the sound (though tbf English spelling is so bad that it's almost at that level too).
I studied Malayalam (the language of Kerala state in southern India) and the script was fucking awesome. It's purely syllabic and it's impossible to pronounce a written word wrong - you just sound out the syllables and you've got it. Everything else about the language was impossibly alien to me as a native English speaker (like you can't just say yes or no, you can only negate or affirm other words), but at least the script was easy.