[blattimwind]

> A question though: how is humidity handled in modern electronics? Is there any sacrificial used on mainboards

For consumer electronics it generally isn't handled. If you look at the edges of the boards you'll see that they are rough-sawn and not sealed and that there is not conformal coating elsewhere on the boards. Note that while FR and hardpaper material are hygroscopic, the epoxy cases of chips let moisture pass as well.