We build all sorts of websites, some very simple and others extremely complex. This means some websites are very easy to update, and some take a bit more practice.
SaaS websites are designed to be really easy to use. In most cases the page is edited directly.
CMS websites are designed for multiple users to be able to update and share content and they are built more like a filing cabinet - there are a multitude of "drawers", and within each drawer can be a multitude of files and different functionality. This allows for very powerful and sometimes very complex websites, but also means the edit page doesn't always look the same as the public-facing output.
When we first meet to discuss your requirements, part of the conversation is an assessment of your requirements and technical capabilities.