Ask HN: Have tech interviews gotten harder?

I just started job searching again for the first time in a few years and it seems like every problem has been "bumped down" one degree. So medium/difficult questions like the classic "most profit buy/sell stock" are now classified as easy, and the "hard" questions are close to impossible to solve within 60 minutes unless you specifically prepped for it.

Have tech companies made their tests more rigorous (in response to books and sites dedicated to passing interviews) or am I just out of practice?