Hello there! If there are not enough paragraph breaks, your writing would have many problems:
1. Inefficiency
Your writing would appear inefficient if there are no paragraph breaks because it would seem as if you are creating a run-on story without getting directly to the point of interest or conflict.
2. Disorganization
Your writing would seem disorganized with all of your thoughts and different points clustered into one humongous paragraph. Instead of bunching everything together, your writing should be organized into multiple paragraphs so people see where your perspective is and how you transition into it. Without paragraph breaks, your writing just looks messy overall.
3. Grammatical errors
Grammar is a huge topic of discussion in writing. Without paragraph breaks, it is extremely likely that there will be at least 5 grammar mistakes. Organizing your writing into different paragraphs solves this problem though because the errors made are simpler to see and point out; in one big paragraph, a chunk of errors would be present that the reader would take a while to notice.
4. Attention
If there are not enough paragraph breaks, the reader also will tend to zone out and/or lose interest. By going on and on in a massive paragraph rather than multiple smaller and more effective paragraphs, the reader will not really understand the concept of your writing and will not pay as much attention as they would to something they actually enjoy.
5. It consumes time
By using one large paragraph instead of smaller ones, you are consuming your time and others. You would have to do many things to confirm your paragraph is great, most of which being grammar checks, efficiency in saying your point, and not writing a too little quantity of words.
These are just 5 of many instances where not using paragraph breaks can make a person go wrong in a short span of time. With that being said, using paragraphs improves efficiency, accuracy, and it saves you some time. I would highly recommend using paragraph breaks and if you were reading a text or passage with some, these points would be vital to consider. If you need any extra help, do not hesitate to let me know and I will gladly assist you.