bah.
At least there's the option to do it properly, ie with matching parentheses or braces of some kind. But then what when you're editing someone else's code and they used whitespace - you're stuck trying to decipher the indent level and wrangling tabs and spaces and whatever.
Is python not one of the world's most-used programming languages?
Can you not write parts of C++ sans curly braces?
When using curly braces for scoping (which is what they really define, tbh), do lines of code within the scope not end up aligned LTR (or, RTL, depending on your language)?
Do modern IDEs/word processors not have the capability to replace ASCII-defined tabs with spaces and vice-versa?
Seems like having issues with spacing is a you problem; most people handle it just fine.
Sure Python is popular, like k-pop, but not necessarily because it's the best, and certainly not because of significant-whitespace, which I suspect even Guido regrets (eg in interviews, he hardly seems to defend this choice).
Yes, you often format your code anyway in a way that could be used to ascertain scopes, but to me, using an actual delimiter is like double-entry book-keeping, and easier than manual formatting; You write your code with delimiters. Your IDE formats accordingly (with style rules that you can choose BTW). If it looks weird, you messed up the delimiters and it's obvious. Not to mention copy/pasting code, moving blocks around, etc; all fraught or painful with significant indentation.
Form follows function, not the other way around, IMHO.