I think, new players could have problems with wealth.
Old dogs know: If i increase my wealth by mining plasteel, i get a hell of a raid.
And as a new player, you didnt think something evil. You think "hey... this is the best building material. Better catch it now!".
It should tell you, that raiders are attracted by wealth and everything you have counts to it. If it is on the ground or in your store.
This is very true. I had a small mechanoid attack, only one caterpillar but it dropped its Minigun when I finally managed to kill it. Things got very hot after picking the Minigun up. I can remember thinking it's not my fault, it's not my fault stupid bug.