Connect split levels, landings, window wells, basement/foundation windows, hand rail, ramps,and more

Agreed. They need split-level houses for more interesting and realistic builds. Sims 3 let you connect walls to the foundation. They should have improved on this, not gone backwards. For instance, my Aunt's house is a duplex and she has stairs that are split-level, going up to a little carpeted platform before coming up, the other way, for a carpeted second floor. I'd love it if you could have houses like this. I'm not a builder, I'm a fashionista, but I like interesting houses for my sims to live in.