Do your own research on why large stools are a sign of gut damage because it's a well documented fact. So is the fact that grains and beans are difficult to digest and can cause gut damage. I personally know people who can't eat popcorn because the outer shell causes tiny tears all through their guts. By the way, I was talking specifically about grains, beans and nuts not "whole plant foods," so you went off at a tangent. Every healthy meat-eater makes a habit of enjoying their fruit and veg.
Much of what you say is true but irrelevant to the issue of gut damage. Everything needs to be in balance, including the amount of fibre consumed; too much is as bad as too little.

If you used the daily recommended amounts of all vitamins and minerals, as guidance, to calculate the food an average size person would need to eat as a healthy vegan, there would be more food than you could physically eat, unless you juiced a good deal of it to remove the fibrous bulk, or are willing to eat and shit all day like a typical herbivore.
So, when you went off on explaining why fibre is so beneficial, you completely missed the point, although, I will concede that I didn't explain it fully. You also missed the point that a healthy vegan diet is expensive, not the poor diet that the average vegan eats , which fills them up with bulk, but more often than not leads to leaky gut syndrome.
And, btw, if you make assumptions about what someone is saying, in lieu of asking for clarification, and your limited information leads you to the absurd, the fact that you walk away feeling satisfied says much about you.