They were way more durable, no shit. I had an LG flip for years, then while everyone was moving on to the first generations of smartphones I had a slider for about 3 years. Finally buckled and bought a Samsung Gravity T599 on the cheap, which lasted less than 2 years before it started eating batteries like mad. From there to the Moto G4 Play, and so far it's behaving.Had a shitty Motorola flip phone for 5 years. Can't keep a smartphone for more than two.
EDIT: Galaxy Exhibit, not Gravity. Gravity was the slider.