Honestly, Mastodon's official application has a horrible UX/UI. It's look is, well, decent. It has a Material You-alike design, but it's not intuitive at all.
A small example is editing your profile: many buttons have the wrong position or icons. A smaller issue is the custom emoji panel, which displays empty instead of showing a toast, but that's fine.
I'll wait for the official application getting somewhat of better. Until then, I'll stick with Tusky.