we don't even use indents that way in natural language. We use things like bullet points, we need specific markers.

space is for spacing, tabs are for tabulation, they are not in any human language I know of used as terminators of statements. You know what is the equivalent of an indent or a semicolon in english? a period. <-

We have paragraph breaks just like this to delimit blocks of english statements.

A semi-colon is used to indicate part of a sentence is done, yet there is still related continuation of the statement that is yet to be finished. Periods are confusing because they're used in decimal points and other language syntax, so a semi-colon seems like a good fit.

If I had my pick, I would use a colon to indicate the end of a statement, and a double colon '::' to indicate the end of a block.

func main(): int i - 0: do: i=i+1: print(i): while(i<10):: ::

another downside of indentation is it's award to do one-liners with such languages, as with python.

There is a lot of subjectivity with syntax, but python code for example with indents is not easy for humans to read, or for syntax validators to validate. it is very easy for example to intend a statement inside a for loop or an if/else block in python (nor not-intend it), and when pasting around code you accidentally indent one level off without meaning to. if you know to look for it, you'll catch it, but it's very easy to miss, since the mis-indented statement is valid and sensible on its own, nothing will flag it as unusual.

In my opinion, while the spirit behind indentation is excellent, the right execution is in the style of 'go fmt' with Go, where indenting your code for you after it has been properly parsed by the compiler/interpreter is the norm.

I would even say the first thing a compiler as well as interpreter do should be to auto-indent, and line-wrap your code. that should be part of the language standard. If the compiler can't indent your code without messing up logic or without making it unreadable, then either your code or the language design has flaw.