Arguably people are still trying to "fix" jabber. For example XEP-0280: Message Carbons should help with multiple clients and XEP-0313: Message Archive Management (trunk Prosody, released Gajim, patches for Pidgin) finally bring an archive of messages synchronized between clients. Other extensions like XEP-0138, XEP-0198 or XEP-0237 would help mobile clients (e.g. Conversations for Android).

My only gripe is what took so bloody long. Google Talk debuted 10 years ago and IIRC had an online unified message archive (in gmail) for as long as I remember (2007?). It took 8 years to replicate that feature? "Good enough" ethics at work indeed.