You can delete and reorder tracks and this new state is written back to the disc. There's nothing else that does this.
You can't delete a song from a cassette. You can overwrite it with noise but that's not the same thing as skipping it. It's not random access.
You can't delete a track from a CD either, as they were not writable back then. Even today with a re-writable you can't easily delete a track, you'd need to rewrite the entire disc.
You can't reorder a song on a cassette, obviously. You can't really do this with a CD either, other than rewriting it fully with the new order. You can program a CD player to play songs in a particular order but this is not persisted across players.
MiniDisc can do all of the above and will do it instantly. This allows a music buff to constantly tweak and optimize their playlist. You can quite compare it to your current Spotify playlist, but now physical. No other physical media allows you to manage a playlist like a MiniDisc can.
The reason I know this is my dad's 30 year (and ongoing) denial in this not being a more widespread standard. He has this cute little box with 8 MiniDiscs in it. Each crafted to perfection in personal meaning, genre, order of songs. He plays it every day.
I look at it with admiration. Because it works. It worked when I was a teenager and now that I'm middle-aged, it still does. It didn't get outdated, get 17 trillion UI updates, require a password or have ever-changing terms and conditions. It just plays. For 25+ years in a row.
Long may it keep playing.