I mean, what’s the problem with most ‘complexity’? We have no method for account

I mean, what’s the problem with most ‘complexity’? We have no method for accounting before computers, lots of memory, bayesian categorizing and prediction, that can measure and reduce to analogy to experience. I mean, mathematical reducibility, computational reducibility, cognitive reducibility is the same freaking problem: how to make it simple enough for us to ‘compare’.