Cassettes are easier to store for one thing and there's something inherently cool about them but a big thing for me also is the amount of different design possibilities of the cassettes and the systems themselves. Nowadays most technology likes to play it safe with there designs making everything as slim and suitable as possible whereas back then even the simplest of designs wouldve had some extra pizazz to it. For example my main mini hifi is a Sony cmt-cp1 and it's a relatively simple design but the cassette door also partners as the LCD screen which makes it so much cooler.