Wow, this is conflating things that are not the same in an incredibly misleading way.

Hey, that was 15 words, and I had them all in my head at once before I started typing! I was able to form a sentence of more than seven words all by myself!

You seem to be misapplying the concept of working memory, where seven (plus or minus two) is about arbitrary and unrelated words or numbers, not "items." In fact, it's generally seven for numbers, but lower for words. And again, that's unrelated words, like "person woman man camera tv," but probably even more unrelated.