I am doing most coding in two languages right now: Python and Javascript. I have never wished that Python had string.charAt(i) but I have often wished that Javascript had string[i]. When I've iterated over the characters in a string in Javascript, it has never occurred to me to write it using str.split('').

By irrelevant analogy, I have never used complex numbers in Python or Javascript and I can't see any obvious reason to support them. It just confuses people who inadvertently write cmath.sqrt instead of math.sqrt. For the few people that use complex numbers, they would be better served by a tuple of real and imaginary parts. As someone who doesn't use them, my opinion is clearly more important that that of those that use them.