Does the Facebook export tool preserve any metadata? That's the major annoyance I've had with FB photos, years later... none of the dates are correct.

I've done the same as you, importing every family digital photo I can find into iCloud Photos. Flip Phones, Palm, BlackBerry, early digital cameras. $10 data cables from eBay are the way to go.

I've yet to tackle the film photos and slides, but that's next on the list.