- All clients are straight up bad but this is mostly personal opinion. - I don't want to maintain and pay for a personal instance - On public instances there is always the risk of the admins deciding not to run it anymore without notice. In that case you lose all your followers. - Due to how it's designed; some things are very inconvenient. For example; when I click a link to someone's profile on the internet, I can't see if I follow them or not unless they are on my server. Then I have to copy their url, go to my instance, search and follow. Too much friction for a simple and one of the most important actions of the platform. - With these inconveniences (that are not easy to solve without centralization), it's imho impossible for it to go mainstream. It requires a certain level of tech-saviness. Even the concept of "choosing an instance" is confusing for most people. I don't want to just follow or be followed by techbros and edgy artists. I like having normal converstaions with regular people.
I would be interested in an alternative to Twitter but in its current state, Mastodon isn't that.