Earlier quoted context omitted.
ICQ and AIM were pretty much dead already. Microsoft really missed an opportunity, I remember using a third party app for Messenger and the mobile experience wasn't great. Skype was too focused on voice and video calls, not seen as an instant messaging app, even though it could very well have been. The biggest fumble really comes from Google though. I was using Google Talk as my main messaging app on PC, and Android…
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 remember using Hangouts (and Google Talk before it) with almost everybody in my social circle. It had XMPP interoperability for a while (which let me use it at a computer, even with my phone battery dead, at a time when WhatsApp was available on the phone only) and it otherwise just worked.
I never understood why Google went out of their way as much as they did to kill a perfectly fine product in favor of various alternatives that just looked like yet another WhatsApp clone, including all the deficiencies of that (i.e. being single-device only, not using the existing Google account social network etc.)