You don't need to use the official Mastodon apps, they're not the best way to use Mastodon. The official apps only arrived last year, and they were intended as "Fisher Price My First Mastodon" things with a restricted set of features.
Third party apps have been around longer than official ones, and include way more features. You can sign in with the same account on all apps.
On Android try Tusky, Fedilab, Megalodon, Tooot
On iPhone/iPad, try Toot!, Ice Cubes, Ivory, Mona
@feditips Although a warning for new users thinking of trying Tusky: for reasons known only to the author it doesn't include the Trending Posts feed, so you're going to be missing out on one of the most important features to help you get started and discover accounts to follow.
Yeah, that is indeed a major missing feature.
Having said that, they just added trending tags so I'm guessing trending posts will get added too?
@feditips When I asked back in December they said it wasn't planned…
Oh darn... :(