I’d say don’t knock it until you’ve tried it a few times.
Took me a good few rides to remember that I could now drop my seat.
I always fancied one, but couldn’t justify it. Had a rush of blood one day though, and ordered one. I’m glad I did now, I use it more than I ever thought I would. And like others, I rode for years without one.
I think the issue is that it is just a seatpost. If it was something with a bit more substance, but that had the same effect, it might be easier to justify.