No, they're breaking with accessing a part of
the internet that web browsers used to support, an no one does anymore. They are most certainly not break
the web itself. These are different things: if you need FTP (and let's be real: you don't), then as a user you still have TONS of options available to you, and as a host even legacy systems using ancient versions of Apache can already serve file listings as standard web pages. Just turn that on.
Your web browser doesn't need to support FTP. It just needs to support the web. Everything else is a bonus, unless it's a security liability. Then it has no business being in there.
