This article from Zulie Rane demonstrates how unreadable an article can become if the writer is focusing on SEO too much:

https://medium.com/zulie-writes/seo-on-medium-a-2022-guide-for-beginners-cfca581fcf1c

How many times does she repeat "SEO on Medium"? 29 times! How many times does she mention "SEO"? 59 TIMES! How many times does she repeat "Medium"? 76 TIMES!!!!!