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That is a fair point.Often the space is, nt available in older installations. In newer installs space is generally a non-issue. But I can assure from experience that once you install a CU with dual module rcbo, s you will find yourself seeking to "make the space" on your next install. I find installation time is nearly halved. Its a bit like comparing a WAGO push in to a traditional connector. They are also very convenient for testing and for faultfinding.
I don't doubt the benefits, but was thinking more from a customer perspective in domestic settings and exterior space used as opposed to interior space available.