Mona wrote with a beautiful simplicity of style.

[kadioguy]

sim‧pli‧ci‧ty
noun [uncountable]
Mona wrote with a beautiful simplicity of style.
https://www.ldoceonline.com/dictionary/simplicity
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Why is the word uncountable but there's an article in the example sentence?

 

[dunchee]

A | meaning of A in Longman Dictionary of Contemporary English | LDOCE

A meaning, definition, what is A: the first letter of the English alphabet...: Learn more.

www.ldoceonline.com

I quote:
10 used before nouns that are usually uncountable when other information about the quality, feeling etc is added by an adjective, phrase, or clause

 

[kadioguy]

A | meaning of A in Longman Dictionary of Contemporary English | LDOCE

A meaning, definition, what is A: the first letter of the English alphabet...: Learn more.

www.ldoceonline.com

I quote:
10 used before nouns that are usually uncountable when other information about the quality, feeling etc is added by an adjective, phrase, or clause

Could you please tell me why you used the present simple of the verb "quote"? Does that usage refer to either of the following?
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[Update]

(For those who are interesting in this topic)

Friend: ”Quote” is like something someone else said. Like, if you say ”Jim is cool” and I say I quote you said ”Jim is cool”, that means those are your exact words.

Me: So that doesn't mean it's a habitual action or something like that.

Friend: No, it doesn't.

Me: "I quote" means "I [now] quote", right?

Friend: Yes.

(Edit: Added the content.)

 

[5jj]

Could you please tell me why you used the present simple of the verb "quote"? Does that usage refer to either of the following?

Try not to sidetrack this thread.

 

[probus]

Imagine the last two words had been omitted: Mona wrote with a beatiful simplicity. Would the article trouble you then? I'd say the indefinite article is optional because it changes the meaning only very slightly, if at all.