Food science is crazy and unreliable (difficult to perform relevant research, many confounding factors, often sponsored by groups with questionable motives, etc). But food anecdata seems just as crazy.
I eat no fiber. If you would just try this diet for yourself then you would realize, just like tens of thousands of other people have, that it makes your bowel movements much smaller and much easier. Literally everyone who tries this diet notices this effect. You spend 80% less time in the bathroom.
What makes you think that smaller stools are somehow better? Smooth, bulky stools with a decent amount of fibre and moisture are ideal. Makes for easier travel, easier passing, and little (or no) wiping.
I'm not interested in spending 80% less time on the toilet (going from less than a minute to 10 seconds just seems like a pointless optimization). I'm also not too interested in the purported anecdotal experience of "tens of thousands" of other people. This diet seems like a terrible idea, both from a bowel health point of view, a climate point of view, and quite frankly a taste point of view.
Not eating vegetables/fibre seems like a miserable existence.
Do you eat fibre? Or do you shit literal bricks?