Lifestyles: how's your experience?

Seems to me that they are basically doing what some mods do, they create longer-lasting behavior-based moodlets. Of course depending on what you do... they can be easier or harder to obtain in the first place. My Sims live in Sulani and swim a lot so both got Energetic and Outdoorsy Lifestyles. Both also host a lot of yard sales, so both got People Person.

This means my two Sims have three Lifestyles that are identical. The fourth lifestyle... my one Sim that learns Robotics and do most of the upgrades and repairs has gotten the Techie Lifestyle. The other has never managed to get a fourth lifestyle yet after tens of hours; I guess she doesn't do anything distinct enough to give a lifestyle.