Dell and Lenovo may limit mid-range laptops to 8GB DDR5 RAM in response to rising memory prices
(www.notebookcheck.net)
Depends on the the type office work.
If you use excel heavily with large datasets or say data vizualization software like PowerBI and Tableau, 8GB is definitely not going to be enough.
That being said, my grandma has an a 6GB RAM Windows 10 machine and it works fine for her relatively resource-lite use cases.