The super advantage of Lisp (including Scheme): Its format for defining data is the same as for writing code, making macros a natural part of the syntax: You can change your source code just like you’d change any other list (or rather tree) data type.
However all this can be represented fully without parentheses — and this is possible with Guile using a reader extension without losing any of its power. This is realized, for example, in wisp — a language frontend for Guile: http://www.draketo.de/english/wisp
It’s a full Scheme, but without the parentheses (behind the scenes it simply infers the parentheses, adds them and hands the result to the regular Scheme frontend in Guile).
In short: I think this question is justified. But there are many people who start preferring parentheses when they get over the initial readability barrier.
However all this can be represented fully without parentheses — and this is possible with Guile using a reader extension without losing any of its power. This is realized, for example, in wisp — a language frontend for Guile: http://www.draketo.de/english/wisp
It’s a full Scheme, but without the parentheses (behind the scenes it simply infers the parentheses, adds them and hands the result to the regular Scheme frontend in Guile).
Wisp is also standardized as Scheme Request For Implementation 119: https://srfi.schemers.org/srfi-119/srfi-119.html
In short: I think this question is justified. But there are many people who start preferring parentheses when they get over the initial readability barrier.