Reading a paragraph that is 45 sentences long is tedious, dull, and often feels like a marathon without the promise of an ice bath at the end. That’s why there are paragraph breaks; they are rests to the weary vast expanse of the written word in which authors delight. Giving your readers a paragraph break not only breaks up the visual aesthetics of the page, it also lets them have a moment to digest, to consider, and then to reengage at the beginning of a new paragraph.
It’s also nice for you, the writer, to take a moment to observe your last paragraph, and think if you’re going to continue down the current path.
Giving rests in writing is good. It is kind to the reader. Be a good, kind writer.