This is why we need specific services (like Slack or HipChat) that are XMPP but maintain their own ecosystem, clients, specific feature sets, etc. Then if you want to use third party clients (eg. for better accessibility, or because your platform isn't supported officially, etc.) you can, but if not you can use their clients. HipChat was almost this way (I used Mcabber with it extensively), but had just enough bits of the protocol that ignored the XMPP spec or were only accessible through a second non-XMPP channel that it was a bit annoying.