System diagram of a CRUD SAAS isn't going to be a critical business secret in the same way it might be for a company that does stream processing of marketing/advertising data off of twitter or video/radar analytics. Or a real-time fintech trading company. Many companies are a Python/Django monolith on Postgres with redis & || memcached. That system diagram isn't going to let you disrupt the online medical services industry but it's what a lot of them use.