The official Mastodon app really needs to add support for the "Local" timeline.
It was (presumably) left out because on larger servers it's an overwhelming firehose and seems useless.
However, on smaller servers it's a really important way to build a sense of community.
Instances like https://social.chinwag.org put a lot of work into making their local timeline pleasant for their members, and they have withdrawn from the https://JoinMastodon.org directory in protest at the lack of Local support in the official app. This is a bad sign, it shows something has gone wrong in relations with smaller instances.
Small servers are really good for Masto, because the more small servers there are, the harder it will be for any amoral billionaires to try to buy up the network.
If you agree that the Local timeline should be added to the official app, please add thumbs up to the relevant issues on GitHub: