I've found an inconvenient limitation on dynamic forms: if your record page has tabs, you can't use dynamic forms in one tab while keeping the page layout on the main tab.
The scenario in which I've attempted to use dynamic form was that of a very long page layout which the client wanted to keep, but wanted a separate tab with fields from one of the sections of the page layout so they wouldn't have to scroll down and just click the tab instead. 🤷🏽
In that case the dynamic form took over the edit page and replaced the page layout.
The dynamic form didn't have the fields that were required so it wouldn't allow the record to save.
I had to create a configurable LWC just to display those fields in the separate tab and stop using the dynamic form.