Much of plant fiber is approximately indigestible to humans. The primary benefit of consuming insoluble fiber is to more rapidly push the other insoluble fiber that’s sitting in your intestine out. If you don't consume fiber in the first place there’s no problem. There are no clear nutritional benefits to consuming fiber. Anyone saying you will have bowel problems if you don’t eat fiber is (literally) full of shit. It’s more like you should eat a lot or none at all (I prefer the latter).

> LDL cholesterol is pretty bad given that they build up in your arteries causing arteriosclerosis

It’s not that simple. If you look into it, the cholesterol studies that boil down to “LDL bad” are excessively simplistic. The current best knowledge suggests that the implications of blood cholesterol content are A) better analyzed in relative (LDL/HDL ratio) rather than absolute terms B) highly dependent on genetic factors. There are large populations where cholesterol has a totally different effect on heart disease risk.

Every single piece of historical advice based on nutrition “science” of the form “X common metabolite is bad” has been completely wrong despite being widely accepted. “Fat is bad” was widely accepted for decades. Apply the appropriate skepticism here.

Production of several hormones, including testosterone, is rate-limited by cholesterol availability. Endogenous synthesis in humans is too slow to support sufficient T synthesis. This is likely the origin of the archetype of the manly meat eater, which is almost culturally universal.