In the US the focus and emphasis is on theoretical aspects.
If you go to an academic job right after your phd then all your focus would be on theory and you would know no implementation or practical knowledge, that would make it hard for you to get back to industry. for industry products and implementations are important.
In industry you will have challenges day after day and there is lots of money ready to improve stuff. But in Academia you need to get funding work with a student for 4 5 years and then he/she graduates and you this process allover again with some other students.