If you are going to marry someone, or go into business with someone, or travel with someone, it is wise to "get to know" that person beforehand. It makes sense to recognize that people change, sometimes slowly and sometimes instantly and sometimes both. So that means that when I get to know what kind of person you are, you might change and become different. To make matters more complicated, all that uncertainty applies to me all the while, too.
I taught the 5th grade for four years. Then, I went to graduate school for three years and then I taught undergraduate and graduate courses for 37 years. During all that time, I was quite aware of the issues cited about. Another aspect of people is that they may show somewhat different tastes and personalities depending on the others around them.
I blame the brain for the complexity and flexibility of people. These days, we have smartphones, computers, tablets, phones, email,texting, personal visits, social media, US mail. The alphabet and writing and typing are all useful in explaining to others what we are thinking about. Words, photos, drawings all help convey what is going on inside my head. I am glad I can speak, hear, read and write.
