I used Opera GX for a while, but by trying to use opera one, all GX features was missing to me and more important opera one have the tab island feature that seems today just so important to be restricted only to opera one. And as a lot of people do like tab grouping to keep ideas aside while working on something else, it should be implemented to GX to upgrade workflow of their users and make multitasking easier.
To make clear :
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Improve multitasking
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Work organization for users
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Useful in the case of the need to comeback later on a task after another one.