Earlier quoted context omitted.
We care about gmail on all browsers :).
What about people who don't like or use the Gmail web UI (I use it over IMAP) but would still like to use Google Talk to stay in touch with friends? Is my only option to use third-party clients? I like Google Talk but dislike Gmail, and tying the two together doesn't really work out in my favour.
You should also probably realize the point of using XMPP is that it's an open standard, and anyone is allowed to make their own implementation; contrast with the uneasy interoperability of, say, MSN Messenger with Pidgin. Now they're using Jingle, do you need a first-party client? You don't expect first-party SSH clients from your hosting provider, or first-party email clients from your ISP. And god knows there are enough IM/VoIP clients out there, so I'm all for thinning the herd...