The above rationale is also why I'm big on punctuation, formatting, and also use a fair mount of italics, underlining, enumeration, and other embellishments in my writing. I'm doing my best to communicate to my reader, and all these things, including paragraphing, facilitate that. Proper (and full!) vocabular doesn't hurt, either.
It sounds like you're still not quite getting the topic. Let's try again.
Let's take a sentence with commas, some words, some more words, some more words again.
Now, let's discuss it without commas some words some more words some more words again.
The question you are answering is, 'do commas make it better?' Yes, of course they do. So you think you answered the issue; you haven't.
Now, imagine your response to the above sentence without commas was that you couldn't finish reading it. You tried. I said, but can't you just read it, and while it's not as easy to read, decide to pause a little when you want - some words (you decide to pause), some more words (you decide to pause), and some more words again.
The question isn't, which is better. The question is, shouldn't it only be somewhat worse - and not have you say it was such a burden you were having a hard time doing it? Why is it so much harder than expected, even though it's expected it is somewhat worse? Why can't you choose to pretend it has commas and instead have a hard time doing that?
Now I assume in that example, it was more as expected. You could read the sentence without commas, and it was worse, but like expected. You could read it even though you found it worse than with commas. No issue.
But paragraphs seem to have a more powerful effect than expected, making it quite hard to read the text. Raising the question I asked, why do they not only 'help', but instead are so important that the effect is much larger than expected where you almost cannot 'add your own paragraph breaks' pausing when you want, which should be doable and only 'somewhat harder', not as much as it turns out?