I hear you on the 3GS. I had one myself until about June 2014. No case either for the three years I had it. I gave it to a friend who needed a phone since the antenna on his 3GS was bad.I see your iPhone 5 and raise you a regularly used 3GS. In fact I used it all last week with my SIM in it as my main phone to get away from the distractions of social media as I don't install FB/Insta/etc on it. Great music player (iOS 6 and below had the best music app), still good battery life somehow, good performance with the stock apps and Messenger, Opera, etc other light apps.
I use it totally naked and it feels great in the hand.
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My iPhone 7 though, I have an Apple Leather case on it for now to keep it nice at least for the first year or two then it'll probably end up like the 3GS if not sold. It's the Jet Black model though so that was the main factor for a simple case. I love the saddle brown leather though.
As far as my previous devices. Droid Incredible, Samsung GS III, BlackBerry Z10, HTC One M8, Moto X, HTC 10, iPhone 4S, 5, 5c, 6 Plus, 6S, and SE all never had a case when I owned them. But none were as expensive as the iPhone 7 either as it was straight from Apple Unlocked and I plan on keeping it for many years this time. Though I always say that.
Also, the JB iPhone 7 is far from slick for me, the 3GS though, it's a bit slippery but easy to hold in the hand and curved so it's a non-issue. It also feels like a tank.
Which is another reason I keep my old devices. I've been able to help people over the years by giving them fully functional devices.
Either my wife's 5 or my 5 will die at some point or I will be able to give them to Sprint customers who need a phone.