For all its ills, Twitter has the advantage of aggregating a plethora of viewpoints into a single service. If you want to find out what people on all sides of politics think about an issue, you’re just a hashtag search from that information.
Mastodon, the much written about “alternative”, is still a platform in its infancy that, despite a claimed 2 million active users a month, feels a little underpopulated (Twitter has 237.8 million daily active users). The main reason is that you join a server which supposedly puts you with like-minded souls, rather than being part of a kaleidoscope of opinions.