From a work science standpoint I can see the benefit of separation. Search must be working through both at the same time if I want to.
What makes the TABS difficult for me now is that they disappear when I change between work and private account. In General I like them thous, its much cleaner then cluttering everything with double clicked extra windows for multiple notes. I love the TABS.
Positive is that the is a note move between the private and business accounts again and not the copy and delete workaround. I did not believe myself first how often I move notes between the two.