Thanks for reminding me why I don't use Vivaldi.
In other words, I'd like to assume the best intentions, and they might yet choose to rectify it.
But they all do this. Passwords and bookmarks that can't be exported or transferred easily are the usual suspects
Vivaldi seemed big, bloated and slow the last time I used it.
Passwords and bookmarks are freely exportable, and even if they aren't in the future, they can be transferred to another computer or extracted from the profile data without issues.