I think this is not true, Nim used to have a Braces syntax, and was removed because nobody used it for several years, same happens with other syntax were both are allowed, CSON can use Braces, yet still everyone uses indent, CoffeeScript can use Braces, yet still everyone uses indent, YAML can use Braces, yet still everyone uses indent, so on.
The same happens with semicolons at the end of each line, do you use semicolons at the end of each line on Nim?. Marketing and Design worth more the effort IMHO.