The recommended daily fiber intake is 25g for women and 38g for men in the USA, and 95% of us don't meet this amount. This suggests an urgent need for us to increase our daily fiber intake, which can be achieved by swapping out ultra-processed foods and animal foods that are void of fiber with whole plant foods such as fruits, vegetables, legumes, whole grains, nuts, and seeds.
That's not really the concern. It's just bulk. As long as it is well hydrated when you consume it, it's very inert and you can't really have too much. If it's still partially dry, it'll jam you up until it sucks enough water out of you, so that's no good.