I wouldn't call fallout 4 the same formula as Skyrim. The world building is similar, but the way you interact with it is vastly different. The focus on gunplay keeps things at a distance, vats gives you 360 threat detection in most cases, and can create a system where the game basically plays itself in combat if you want. Fallout has hard level gates, where skyrim is a softer gating which makes the world feel different.