I've seen requests for this (not just adding multiple domains per entry, but a user-global equivalent domains feature) going back as far as 2015, with at least one other thread that wrapped up in 2021 with a promise from a 1Password team member to implement the feature in the "next release". This feature has been "passed to the team for consideration" a number of times. Is there a chance it will actually be implemented? Please be honest so I don't have to waste time helping my family make the transition from LastPass if you're not going to do it.
I never thought I would be holding up LastPass as an example of what to do right with a user interface, but they do get this thing right.
There is a real use case for some sort of global list of equivalent domains. A growing number of websites hand off identity to a third party. In a family of multiple members, if I have to type in multiple websites for a login item for each person, it removes the benefit of a password safe. I want a tool that lowers the barriers to using good passwords. This is not even for multiple family members; sometimes, one person needs multiple logins to the same site.
My most recent example is "myuhc.com" which uses "healthsafe-id.com" for its login. There are many others, such as Microsoft's many services with a common login, Apple, etc etc etc