If you already have quotation marks, what's the point of the commas?
> Commas exist mostly to help JSON be human-readable. They have no real syntactic purpose as one could make their own notation without the commas and it'd work just fine.
https://stackoverflow.com/a/36104693
Elsewhere such commas can be optional, e.g. in clojure: https://guide.clojure.style/#opt-commas-in-map-literals
{ foo :"bar" baz :"bak" quux :[ a,b,c,d ] lol :9.7E+42 }
my-abstr x y z foo: "bar" baz: "bak" "quak" quux: [a, b, c, d] lol: 9.7E+42
my-abstr x y z, foo: "bar", baz: "bak" "quak", quux: [a, b, c, d], lol: 9.7E+42
Coloring things is a luxury, and from my understanding not many people understand that fact. When you work at the trenches you see a lot of files on a small viewport and without coloring most of the time. Being able to parse an squiggly file on a monochrome screen just by reading is a big plus for the file format in question.
As technology progresses we tend to forget where we came from and what are the fallbacks are, but we shouldn't. Not everyone is seeing the same file in a 30" 4K/8K screen with wide color gamut and HDR. Sometimes a 80x24 over some management port is all we have.
[(a b) (x y)]
[a b, x y]
{ foo: "bar" baz: "bak" quux: [a b c d] lol: 9.7E+42 }