Maybe it’s a problem with translation? “Limited” comes with negative connotation, as in “you can’t do as much as the other, non-limited guy”. Maybe you wanted to say “minimal” instead? s-expression based syntax is as powerful as it gets, as it allows to concisely represent any AST.
When talking about Lisp syntax, what you almost always want to say is "lisp has $most-positive-word-in-context syntax". So it's "limited" for some, "simple" for others, but the overall point is the same - no cruft and unnecessary sugar, and uniformity allows for easy programmatic transformations of code.
