Oh yes, Googles insistence to the horrible Chrome plugin (and ONLY chrome plugin, you're SoL if you want to use any other browser) instead of a slim desktop app like iMessage/Telegram is pretty much the reason why I've abandoned Hangouts.
I mean, it's missing features like searching by name (there's a workaround by going to calls, putting in the name, and choosing SMS) and other things, but it's worth it to be able to type and copy paste texts.