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I will have Gaia for 2.3.3 too. It is on the list - I just need to finish other stuff and other promises.
Working with layouts in 2.3.3 is ten times easier and you don't need any plugin for this.
What layout did you miss in Gaia? I could add it to theme.
What I am curious is - do you use custom layout fields (options for layout). If not, that plugin is not needed with new core.