"more lively" sounds like just another way of saying "immersion breaking" to me, in that it's a really silly argument. It just translates to random chat spam - "LFG2M AC, NO MORE THIEVES PLOX" doesn't really build community.
There's no point to that system. We experienced it in TBC, and it wasn't better than an automated tool. The only reason people hate an automated tool so much is because of all the inherent flaws that already exist in WoW's combat and loot system. As I said above:
1. No tanks
2. No healers
(the above means: no long queues, ever, unless there just aren't people queueing)
3. No shared loot (thus no drama over ninjas)
And hell, I'll add another
4. You can travel to other servers for free