If you want to use a password outside the Samsung Ecosystem then it is a bit problematic. Samsung Pass is not as feature-rich as LastPass/Roboform/1 Password. Only if you get all the functionality of the above mentioned password manager then I'll use it as my primary password manager.
One UI 8 has no classical Dex. Please, Samsung, don't remove this feature because the maximum number of students do not use external displays. They always use Dex. One of the best features is Samsung Dex, which is not found in Apple devices.