this is their job to be this way. this is how they got to the skills they have. Only thing you can do is accept it, they are not going to change. Nobody does,

this is their job to be this way. this is how they got to the skills they have. Only thing you can do is accept it, they are not going to change. Nobody does, people get lazy with age and experience:) Simple thing which worked in my companies is saying: <Hey this is cool, though we have another thing in the priority right now, can you hop on it and we can discuss your complexed system after it> and this <after> never came, because usually it is intentional idea to write something complex.