Thinking About Math Textbooks

When I read through the article about first and second person pronouns, I was surprised to read that first person pronouns were not in either of the textbooks that were used for the purposes of this article. When I think back to my personal experiences with mathematics textbooks, most if not all examples of person pronouns involved the word 'we', which would fall under first person, NOT second pronoun. Perhaps it is my recency bias playing a role, and undergraduate math textbooks use these first person pronouns, whereas secondary textbooks still exclusively use second person pronouns. If so, then I must ask, why? The article states that second person pronouns helps to connect the speaker to the reader directly; does this only matter for adolescents, and not for young adults?

I understand that today there is a push to not use textbooks, and some teachers are slowly becoming less dependent on them. I've also talked to some teachers about this topic, and it's apparent to me that it is quite the controversial one. However, I still think that textbooks serve a purpose and shouldn't be rid of entirely. Of course, textbooks are expensive and a new version with minimal changes seems to come out every few years. But they also contain a wealth of information in an organized structure, with many additional resources embedded in them. I will say, I think teachers should opt to make their own examples and not 'teach to the textbook', as it allows for them to adapt to their unique class and their needs, compared to the general examples and rigid format that a textbook supplies.