Edge's "Set Tabs Aside" is Edge's Signature.

HiSky   It looks like Set Aside tabs is being replaced with Collections.  I've been experimenting with Collections -- which allows users to collect, organize, share and export content -- and I'm coming to believe that Collections works more efficiently than Set Aside tabs does. 

I particularly like the fact that Collections  captures sources and creates citations automatically, which saves a lot of time for certain kinds of work.

A few things are still missing (I'm on Dev Version 78.0.268.3), such as the ability to re-open all tabs in a collection, but my understanding is that the missing features are under development and will be rolled out eventually.

In any event, take a look at Collections and see if it alleviates some of your concerns.