The Importance of Using a Unique WordPress User per Person

A WordPress security best practice that is easy to implement is having a unique WordPress login (username and password) for every person who accesses your website or multisite network. Sharing the same WordPress login details with groups of people can lead to a number of security issues and increases the maintenance of the website, as this post explains. Use of Weak Passwords
As a WordPress website administrator you know very well how important it is to use strong and complex passwords. In fact, most probably you use a password manager so you can use very long passwords which are impossible to remember. Though if you have a common WordPress login for a group of people, since many still do not use password managers, and because you do not want to hassle with support, you use an easy password for the shared WordPress users.
Easy to guess passwords were and still are the most common source of WordPress websites hacks. So avoid using shared WordPress logins and always encourage your contributors to use a password manager to reduce the use of weak and easy to guess passwords.
More Complex operations & high maintenance websites
Managing shared WordPress logins is more complex and requires
Source: https://managewp.org/articles/17385/the-importance-of-using-a-unique-wordpress-user-per-person

source https://williechiu40.wordpress.com/2018/05/07/the-importance-of-using-a-unique-wordpress-user-per-person/