Snowdon might be easy, but you still need to be prepared.
Coming down the mountain two year's ago, me and the missus got caught in a rainstorm that wasn't forecast. Needless to say, we were soaked and thoroughly miserable by the time we got back to the car. And that was with waterproof gear.
Last year, a group from my work were doing the three peaks. They arrived at Snowdon with something like 3 hours left. While most of them decided not to go up, the fittest four thought they could run up and back in that time. They packed light because they wanted to be quick. Then they got lost on their way down, darkness fell and they couldn't see where they were going because they didn't pack torches. They slept on the mountain. They were just lucky it was a mild night as there's barely any shelter up there.
I always worry a bit when someone who doesn't walk asks what Snowdon is like and experienced walkers come out with "It's easy". Paints a false picture TBH. Relatively speaking, it is easy, but things can still go very wrong. People do have to be rescued quite regularly, and people do occasionally die up there.