One of my favorite things in EFUA and EFUM was the availability of a ton of little bolt holes, hideouts, dens, and similar that could be found around the module.
I know that there's a lot more "Claimable" and rentable and appable territory but some of my favorite times were being some optimistic fool and a few pals huddled in an alleyway planning big plans. Or a bandit hiding out in the woods with nothing but a spawn point, campfire, and a bag of stolen loot.
While they certainly wouldn't be used by every PC all the time it adds a lot of diversity to both playstyle and RP.
Some with open lock, some with search, etc are still in the module but it just doesn't feel the same as those old places around the Alleys, or the ruined tower in the forest, or etc.
Places to hold shady meetings away from people that required intrigue/etc, or places PCs could try and carve their own turf.
Working on re-adding these. Might take a little bit.