Brep join produces a list of all surfaces

I assumed the “Brep join” component would output one single polysurface. Instead it produces a list of all involved surfaces which makes it sometimes difficult to adress adress the polysurface further downstream.
Is this behaviour intentional? Is there a possibility to produce a polysurf adressable with a single ID? Or are there no "polysurfaces "in Grasshopper? (9.6 KB)

If only people used Merge, they would see the problem actually comes from BEFORE the component ! :smiley:

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thanks to both of you !