Twitter isn't niche when it comes to what matters the most for their platform: having all the most important attention getting users on there. It's dominant. Even Instagram doesn't have what Twitter does on that front.
Twitter has an immense collection of people that particularly matter in their given field, interesting famous people, and so on: celebrities, journalists, media personalities, musicians, authors, politicians, athletes, techies, companies, bankers, VCs, CEOs, entrepreneurs, famous bloggers and gamers, fashion people, etc.
Twitter has an extremely dense, active collection of those people. You can say that you don't personally care about that, however the majority of people very clearly do (and always will).
I don't think the majority of people care, most people don't follow twitter, they might have a user but they don't use it that much. In many non anglo parts of the world most of the conversation is in whatsapp groups which is part of facebook and telegram
Twitter has an immense collection of people that particularly matter in their given field, interesting famous people, and so on: celebrities, journalists, media personalities, musicians, authors, politicians, athletes, techies, companies, bankers, VCs, CEOs, entrepreneurs, famous bloggers and gamers, fashion people, etc.
Twitter has an extremely dense, active collection of those people. You can say that you don't personally care about that, however the majority of people very clearly do (and always will).