I’m starting to acquire a decent number of movements. My thinking was that they should all be kept in airtight-ish containers with silica packets or similar except when I’m actively carrying/wearing them. My tentative plan was a DeWalt stackable storage container which snaps down closed but probably isn’t fully airtight.

However, searching the back archives it seems like most people leave everything out in the open as opposed to sealed up. Am I overthinking it? If not, what are folks using in 2024 to store “extra” movements?

This is perfect, thanks. I'd seen quite a few like this but I was worried that they might not be sufficiently climate-controllable. If y'all are storing them this way, I feel much more comfortable.

Good question Tony, welcome to the club.
See photo, I store in the wood box with glass cover, but there are plastic tackle box storage that appear more waterproof.
All that said, exposure to dust is part of being a
Awatch. If you get a freshly seviced watch you may want to preserve it to prolong service interval.
Surely some of of my collection have not been serviced for decades but I like them all.
Mike