cortizsc is spot on. I used to be able to split out a list of Restaurants/Shopping, Work Vendors, New York Contacts, Seattle Contacts, Vegas Contacts, Old Coworkers, Local Coworkers, Old Contacts, and Friends/Family.
Day to day I. would only want to see Restaurants/Shopping, Local Coworkers, and Friends/Family to avoid having a massive list of contacts. Then on the rare/special occasion I needed to reach out to someone on another list I could simply add them into the view or custom the view based on a need at the time. For example, I fly to New York, I simply add in the New York list.
The way the app appears to work now, I'd have to switch to the dedicated New York list which removes everyone else I need to see.
This is another example of a step backwards in functionality in Apple apps. it's unrelated, but if you need another example of stepping backwards, I'm old enough to remember when the Music app had half and quarter speed scrubbing on the time bar - still bitter about that one.