Earlier quoted context omitted.
Hangouts was the default SMS client in Android for a while, and it worked well enough as an SMS client that I never heard anybody complain about it. Much like iMessage, it could upgrade to internet-based messaging if both people in a conversation used it. Where Google went wrong was bowing to pressure from carriers to stop doing that. Carriers had been much more powerful in the past, and I think Google failed to reco…
I don't buy it. Google just followed iMessage, only two years later, I don't see why carriers would suddenly have an issue with that. Plus Hangouts has never been a mainstream mobile messaging app, and I was a big user at the time. I worked at Samsung then and I'd bet most Android users never launched Hangouts nor even noticed it was preinstalled. Google killed the integration in 2017 when they started betting on RCS…
So it was trying to juggle carrier + OEMs + Android and keep everyone happy.
Anything that upset one party wasn't going to happen. Only in more recent, Samsung/Pixel-centric times has Google had iPhone-like negotiating weight (and will).