Right now only one user (s1, for example) can use SSH to access the server. I think the idea here is that SSH would be used rarely and on a one-off basis, with each user erasing the previous password and generating a new one each time. Unfortunately, this is awful for teams and also doesn't work for services which need persistent connections--e.g. tools like eMagicOne WooCommerce Store Manager, or anything else that requires direct access to the Woocommerce database for bulk import/export/etc. Users either share a password and never change it (terrible for security) or they can't use a wide variety of powerful Woocommerce management tools. Why choose when you could simply enable multiple users with SSH?