A Web page is a "page" only when it is printed.
We are also very constrained by (preconceived) ideas on printed materials and printing industry. There is a tension between things from the printing industry (books, newspapers and magazines in their today format) and things from the Web. All the concepts are not necessary the same in the two worlds, even if Web page have inherited a lot from the printing world. There is a form factor for example and specific features.
A book has page numbers.
A web page has (mechanical) hyperlinks.
I should write a longer article on that but can’t seem to find a way to grapple with the question and form it into coherent thoughts yet.