Earlier quoted context omitted.
Imagine if we said that about web sites at the begining. The Web needs to decide what it want to be? A plaftorm to sell stuff? Contact people? Write? Listen to music?
But the web wasn't about listening to music at the start! It started with organizing documents on a network, at CERN. And it took over existing document platforms by adding a simple point-and-click browser user interface to them, inspired by HyperCard (where do you think the "hyperlink" got its name?) The modern, more economic web, wouldn't come until Netscape added form fields and cookies, at the behest of some of t…
The early web's competition was things like FTP, Gopher, and email-driven apps (e.g., Listservs, the Usenet Oracle). Plus paper-based stuff, like department phone books, mailing documents around, etc. It was hugely better than any of those for many common uses, so adoption was rapid.
Once you have a critical mass of users, then it can make sense to add other things in. But for that first audience, we can't be vague, selling some shining future that will happen eventually.