Hello basj, I made a similar request here, but Waleedov did a nice job of articulating it clearly/succinctly and posting a dedicated topic. If you think it would help, please also forward my request to the team, so they can see multiple customers want this feature.

Maybe you could call it "Sticky Groups". Alternatively, you could add an option to make individual Saved Groups sticky. Then, in addition to the current behavior (open the entire group at once) you could open any combination of apps in the group as needed and they would automatically group. Currently, only instances of the same executable can auto-group in this manner.