I don't think they're trendier but they certainly are really convenient. And perhaps the necessity of keeping them charged gives the owner a bit of responsibility that makes them more interesting.
I must have at least ten of them. It's not just a Seiko thing, some of the Citizen models are very nice as well. So are the solar G Shocks and Edifices, though perhaps not to everyone's taste.
My first solar-powered watch was a Pulsar; I bought it in 1988 or 1989. The capacitor died about three years later. A simple battery would have lasted longer. But the technology is much better now and they last a long time.