Why does it make you sad? Twitter as a concept is a technically superior platform to keep up with news about interesting things you like. Short-form, multimedia integrated, your own curated timeline. It is literally the perfect platform for following artists, musicians, game developers, programmers, whatever, and seeing what they're up to, vs. trying to follow 100 blogs. Unlike RSS, it is interactive, allowing people to communicate and form connections, and the entire "retweet" thing makes people creating cool things immensely more discoverable, allowing more eyes to see their cool work.
Obviously it has been degraded by the switch to algorithm over user curation of their own timeline, literally everything Musk did to it, etc, but old Twitter was good, hence the desire to "go back".