That makes no sense then. A power user may still want to run older OS versions for a reason. Take the training wheels off it and then it'll be a power user tool.
No doubt there are edge cases like that, but I don't fault a project for not catering to the < 1% of users who would fall into that bucket and would probably be the ones that cause trickier support cases. These would maybe also be the user that could just install it without homebrew then, it's not like homebrew is the only way to install software.