This UI must stay and be shown only for old password protected DT2 DB which are now completely obsolete (as you correctly stated before) otherwise for the new encrypted one please do not present this screen since do not reflect the reality.
The username and password are not obsolete and they certain apply to any database, encrypted or not. All databases can have these credentials applied for use with sync security.
Not to be able to change the password is restrictive since I can do it of filesystem level.
Please clarify what you’re referring to here.