Well, as you say I think it's pretty hard to gain a real edge by using this sort of tactic, and you're often just going to end up gaining no real information, giving away
tells and just being annoying. I don't think there are that many players who would significantly benefit from that sort of tactic. Learning tells and stuff is important, but I don't think that talking will really make them more significant- most people just ignore you when you talk to them. With that said, when you watch people life Kassouf you can tell that they have really taken the time to master the tactic and he can gain an edge from his speech play (although it does make him come across as an annoying *****). Maybe it's possible, but I don't think it could ever give you a huge edge.