Different languages and cultures. When you spend a lifetime building reading clues, throwing them out the window makes it harder for people. The languages you mention also have delineation methods that involve more than simple punctuation marks.
What are the delineation methods in Mandarin and Cantonese and Hindi?
I suspect the journey to learn more on your own will inform you better than I can here on HN. Like english, they have changed over time, more often than not to include more delimiters.