I get why other people like/love them but can't see the fascination myself. £ for £ they're heavier than DF bikes, they're less practical for the vast majority of riding I do, and I live in a 1st floor flat with limited external storage space so even storing one would be a major problem.
They solve a bunch of problems I don't have. (Things may change in later life I'm sure, and I reserve the right to change my mind.)
Fair enough, but no inclination to try them means you're missing out on an excellent source of short-term fun. I challenge anyone to hoon around a car park on a Kettwiesel for 5 minutes without acquiring a tremendous grin. (Bicycles are harder to learn to ride, but have their own novelty factor.) Do have a play if the opportunity presents itself, if only for a laugh.
But yeah, they're a pain to store
[1], and if you don't need the ergonomics or comfort there's little advantage in the real world
[2], unless you live in the flatlands where aerodynamics always trumps weight.
FWIW, I'm fairly meh about recumbent trikes, and not through lack of experience. They're initially great fun, they make cycling possible for many people, and they make excellent touring machines. But my recumbent touring bike is also an excellent touring machine, markedly more efficient, better at dodging potholes, much easier to wheel and lift, and I can fit it on trains - the only thing the trike really does for me is immunity to ice without resorting to studded tyres, and having the brakes and gearing to cope with *really* heavy trailer loads. It's a lot like the Brompton - very good at a couple of specific things, and has a certain charm, but not what I generally want to be riding. (And similarly, I reserve the right to change my mind should my power output, arm functionality or ability to balance change.)
[1] Foldable tadpole trikes are a pain to store in a very different way to DF bikes, which can sometimes be an advantage (they're easier to fit in cars, for example).
[2] Fast recumbents being about as practical as DF time trial bikes.