I've never worked for Twitter, my guess is their business idea is "Well, Snapchat has it, Instagram/WhatsApp/Facebook have copied it, we should also offer it.".

I returned to browsing Twitter more after the election, and IMO it hasn't changed, it's just a place to get your dopamine hit when you see a tweet you agree with get traction, or for some adrenaline when you read something supremely idiotic. I thought about replying to 1 or 2 tweets, but geez, will anyone read it, will it change anyone's mind?