Access to your Computer without a password is currently being tested in the Insider Preview version of Windows 10 19H1, later to become v1903 due out in April 2019. To use this feature you will need to create a new style of Microsoft account. If you still like to use a local account then this feature won't be available to you. On the other hand If you have purchased a new Computer or have a fresh install of Windows 10 v1903 then the feature will be available and will work by Microsoft texting a code to your mobile phone when you first login.
To use the feature you will create a Microsoft account using your phone number. When you sign in to Windows 10 using that phone number Microsoft will text you a code to enter on the sign in screen. Once you are in you will use Windows Hello to create a PIN number, fingerprint or face login method. You will never need to type in a password and your Microsoft account won't even have one. You only need the code for a new Computer so you won't have to repeat this process again, you can simply use Windows Hello after your initial access to the Computer.
There may still be a few obstacles to overcome in the Business sector where multiple people logon to one machine but Microsoft are working on solutions for this too.
