Smartwatches (namely Apple Watch) then became a thing because it provided more than time, such as vibrating alerts, fitness tracking, etc.
The conventional wisdom that smartwatches are killing traditional watches is just like the conventional wisdom that Starbucks and other corporate brands push out local coffeehouses: dead wrong. Instead, the new players validate the market and provide an anchor point for luxury goods.
the value proposition for Twitter at this point was different than it is now I believe, but perhaps I am just on the wrong parts of Twitter.
the value proposition for twitter at that time (at least whenever I saw something I thought was valuable) was that it was a TLDR provided by experts regarding some thing. RSS didn't have a length limitation, twitter's length limitation forced experts to write a quick thing as to why you would want to go read anything they pointed to.
When less technical people came on it became a bunch of oh you'll love this, low information tweets, but in the past in my experience they were high information tweets considering the length. So the value of forcing tweeters to provide quality summaries of content for their audience.