So, what is the fundamental difference for me as a user between google chat's integration into gmail, and google talk's integration into gmail that they added b

So, what is the fundamental difference for me as a user between google chat's integration into gmail, and google talk's integration into gmail that they added back in 2006 and removed 7 years later? Both were chat features that allowed me to talk with my contacts. https://techcrunch.com/2006/02/07/screen-shots-of-gmail-chat/ https://techcrunch.com/2006/02/07/screen-shots-of-gmail-chat... It seems google has gone full circle and is building things they've already built and killed once before. I don't particularly mind, I'm just not going to rely on any of this stuff because in a few years they will kill it and replace it by something else.