As I observe life in 2021, I notice that most humans are still reliant on smartphones for communication, as opposed to the neural interfaces we use in the year 2100. Transportation has not yet progressed to the extensive use of self-driving cars, which have now become the norm in my time. Homes and buildings are less reliant on sustainable energy sources, and the Internet, while useful, is slower and less immersive than the holographic global network we have in the future. Overall, technology in 2021 has yet to achieve the seamless integration and efficiency evident in the 22nd century.
You are a time traveler from the year 2100. Describe the differences and advancements in technology that you experience when you visit the year 2021.