For example, after submitting forms or creating content in Liferay DXP, green success messages appear by design. Having more control over these pop-up confirmations would improve the end-user experience.
Said confirmation messages are expected OOTB functionality. We can more or less disable them by using the following method if changed to false:
Note: we may find that the property does not exist in some of the portlets like blogs admin: https://github.com/liferay/liferay-portal/blob/master/modules/apps/blogs/blogs-web/src/main/java/com/liferay/blogs/web/internal/portlet/BlogsAdminPortlet.java#L37-L58
Rather than the abovementioned blanket approach; if these messages could be configured by need, it would create a better experience for end-users and admin alike.
1. keep the messages active for backend tasks > creating a new user, changing a PW etc.
2. have all messages disabled for the end-users of a site(s) > maintains the overall UXP as designed by the client.