I'd say that I'm amazed Google hasn't come up with a competent Slack competitor yet, but then it's "Google" and "a messaging product", the two are like oil and water.
The problem is they can't settle down on something. I can't even tell you what their current messaging product is right now. Google Wave is dead. Google Facebook^HPlus is dead. I think Hangouts is dead? The thing in my GMail gives me notices that it's going away. Is it Google Voice? Why would I use a product with the name "Voice" to type "Text" to people, especially when it used to be a phone substitute. Certainly nothing is integrated, aside from whatever the thing in GMail is that's going away (and a 100 pixel wide chat isn't going to be useful for team discussions, anyway). Messaging for Google feels like "this ought to be something we can be good at, but can't actually figure out what to do".
Google makes "messaging products" but it's just something that floats on top on top of the sea of Google stuff. Like oil on top of water.
What are you talking about? Messaging products are so integral to Google's vision that they can't stop making them.