Now, anyone can create a site instantly and easily. A personal web site perhaps is not a need, but most people, I am sure would not only enjoy having one, but would also find it useful.
Why do teachers need their own websites?

With a site, you can consolidate and make sense of files, links, multimedia sources, and prompts from anywhere into one place. Then, each time you teach a class, you can refer back to the last time it was taught and grow as an instructor.

With a web site, you can communicate with colleagues, students and their parents. A website isn’t just a way for you to communicate with others, it’s a way for others to communicate with you.

A well-done website has global impact. One day, you may get an email from a teacher 1,000 miles away who would like to thank you for inspiration or who may want to borrow one of your lessons. You’ll easily be able to share resources with others.