Even though it is always recommended to log in to your computer using a Microsoft Account, at times, one needs to sign in using a Local User Account and Microsoft has provided an option to do so.
To uphold the same, the brand came up with an excellent concept of Windows ... option. If you really wish to remove the PIN, then the alternative is to use the password. Enable password-based sign ...
To create a local user account, head into Settings > Accounts > Other Users, click "Add Account," choose "I Dont Have This ...