Actually that's not the case with Rhinodillos, they use a special soft end that doesn't wear holes in tubes, with over 3,800 miles on my touring setup and no flats I think that qualifies.
As far as rolling resistance goes, sure, but a person has to decide which is more important, more rolling resistance less flats, or less rolling resistance more flats. But the Rhinodillos are only about 2 watts more. For example, the Schwalbe Marathon Touring tire vs the Amotion tire you're talking about 6 watts difference, add in the Rhinodillos to the Amotion and the difference becomes 4 watts, still less rolling resistance with the Amotion tires with the liners. Rhinodillos are lighter in the difference between thornproof tubes and regular tubes.
While on a regular road bike for fitness riding, a tire liner isn't necessary, but it is an option for commuters who don't want to be bothered fixing a flat on their way to work and be late to work, then get chewed out; or for touring bikes where someone like me doesn't want to be bothered fixing a flat on a loaded touring bike. Plus the additional weight of the liners is nothing when you are already carrying 60 or so pounds of gear on your bike! And the Rhinodillos will provide a bit of a softer ride vs no liner.
https://biketestreviews.com/clean-motion-rhinodillas-flat-prevention-at-its-best/