Well, Python is one language and SilverCreator is another. I try to keep SilverCreator in-line with modern BASIC as much as possible. So having brackets in addition to the MID$ command to print portions of strings would be redundant, while having only the MID$ command gives the new user something to look up and learn.
With the new array support though something like this would be useful for arrays:
FOR EACH array AS item
code
NEXT