II have a tab group for each topic/task I'm working on. I have about 10 groups/80 tabs total, so if I open them all at once it takes a while. With tab groups non active tabs are not loaded right away, so when I'm working I e.g. don't need to open all the tabs where I'm planning a vacation open. I used to use lots of different sessions before discovering tab groups, but it was slower and I lost track of sessions often. Tab Group makes life just a bit easier.