Do not doubt experts on this field. What he's saying is true. > Biological systems are hard to understand and to modify, but maybe that's more due to redundanc

Do not doubt experts on this field. What he's saying is true. > Biological systems are hard to understand and to modify, but maybe that's more due to redundancy that has evolved than to systems that are coupled like bad software systems. No, it's not. It's all highly interconnected. There are no nice decoupled modules. If someone is showing you a module from biology which seems to have no interactions, he's leaving out information. The only reason biological systems are not as fragile (although they also are. E.S. Collizi did some interesting research on why) as you think is precisely because they are so interconnected and redundant. Furthermore, you seem to misunderstand why we don't see fragility. It's not because we get sick instead, but because nearly all of the nontrivial mutations are highly lethal, and the fetus dies in utero and you get a miscarriage. Most miscarriages happen so early the mother doesn't even notice.