So let me see if I understand you correctly. I asked what Mastodon is for. You answered that Mastodon is for having meaningful conversations with people one on one about subjects important to you.
That would mean Mastodon is not in any way comparable to twitter, or any other social media platform of the like. To me it seems that, by this description you provide, it is best compared to a chat room, where you are together with a hand full of friends you already know, and can have a conversation. Just in a timeline that is a bit slower, and a bit more permanent than a chat room, but not quite as bloated as a classical internet forum.
That means Mastodon is not “social media”. The purpose of you being there is not to easily discover new stuff which might interest you. And likewise you also can’t easily reach out to new people with stuff that interests you, and which you think might interest other people. Mastodon doesn’t want you to be able to do that easily. Because Mastodon is an internet forum with people you already know, just with an added word limit.
So it seems I have misunderstood Mastodon. It doesn’t intend to be social media. It intends to be an early 2010s internet forum with a word limit. Now that I know what it is, and that this is what it is supposed to be, it makes a lot more sense to me.