My personal feedback on EP/GP polishes:
Island Living kinda needs a purpose other than cleaning the island. But I suspect that the hotels/resorts will be added to Sulani anyway. Mermaids need UI abilities and weaknesses like Vampires and Spellcasters. It would add a lot of depth to Mermaids.
Get to Work could get a polish too, it could easily add more careers such as Grim Reaper Freelance Career which got the community so excited when it was suggested on the first community survey of the fan-voted stuff pack! And Aliens could also use a UI similar to Vampires and Spellcasters. Again, it would add a lot of depth to them.
Realm of Magic could use a polish to introduce some other Happy Haunts stuff. Tarots, ouija boards, and seances would suit perfectly with RoM aesthetics! It is a shame that spellcasters do not already have access to those. Imagine how much cooler it would be to “necrocall” with seances instead of casting at the tombstone, requiring collective effort to raise dead!
Again, more furniture and decorations could be added to Spooky Stuff Pack in Happy Haunts’ aesthetics. Spooky Stuff Pack has very little to offer when it comes to build-buy features.
All listed above could improve and strengthen the selling points of the mentioned expansions and game packs, even that one particular stuff pack!