I've just finished The Sirens of Titan from 1959 (after seeing it recommended here, actually) and something struck me compared to more recent books. A lot of the more technical stuff is kind of hand-waved away. It's not a criticism, just something that stuck out as I was reading. Is this a trend? Do readers demand more details these days? I've read a bunch of sci fi from the 60s until the present day, but I've only really gotten back into it more recently with Sirens.

Perhaps I've read too much Neal Stephenson, who has likely never hand-waved anything away! The Martian also springs to mind, but that's very deliberately focused on the details and keeping it realistic, IIRC.