Help me understand - why is this so bad?
So when choosing between a lot of bad and propietary options for chat, fb messaging was best.
Except you can't and shouldn't trust FB to make client software; they take to many permissions, they might mess with your (contact) data - the apps have an inflated sense of urgency (hangouts is guilty of this too). And they are resource hungry.
And as fb chat is generally (for me) somewhat asynchronous, the web client was perfect: I could see if there were any new messages, and if there were any new notifications at the same time.
Moving this to one platform, for me, kills the product. At least on mobile. And if I can't use it on mobile, I'll probably slowly stop using it altogether.
For me it's mainly bad, because I see no clear alternative. Facebook was the one silo I could reliably reach most acquaintances. I'm not on snapchat, but even if I was, there are people I might occasionally reach out to on fb, that I probably won't contact/be contacted by on snapchat. Google social efforts is a joke, and many people don't really use email for personal communication.