We are so used to only experiencing photography on our computers and phones that it can be easy to assume that's the final product-- and for some purposes that may be the case. However, Digital images are easily lost, whether it be to accidental deletion, devices breaking, going obsolete, or being upgraded.
In contrast, physical works such as prints or books are real, tangible objects that you can proudly display in your home, or keep private to enjoy for years or decades in the future. In this way, artwork you make can become treasured mementos that only become more valuable as time passes.