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Experimental features are the features that are still under the development phase and not ready to be deployed into the actual software or product. It is a feature where the design is not finalized.
Rather than postponing them until subsequent releases of our software, we choose to include them in our software, but disable them by default (for production environments), while easily allowing you, the user, to enable them in experimental environments, play around with them, and get back to use with feedback about your experiences.