I'm a long-time Opera user, primarily because of the simple interface. You are moving in the wrong direction.
There are three concepts which are poorly implemented individually, and when mixed together they are worse.
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Speed Dial would be an excellent tool except that it cannot be customized to fit a workspace. A single configuration is applied to every workspace and therefore nullifies the value of having separate workspaces.
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Workspaces change based on what is open at the time of the workspace closure. If you happen to have closed a tab during a session, it will not be there when you reload the workspace. In other words, the workspace does not have continuity.
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The tab island concept is incoherent. You have not explained how tab islands are different from Speed Dial and Workspace, and how the three could be used together in a complementary way.
I find Opera One to be an exasperating step backward - it has not been thought out so as to provide a helpful and coherent experience.
Two thumbs down.