Why not? You can control-click all the surfaces one by one, so why not allow the use of seed and boundary to speed it up? Isn't that the whole point?
I think this is due to a matter of caution. Seed surface boundary can partially fail when a boundary surface becomes a weak reference or geometry is changed that the boundary surfaces no longer surround an area of interest. These parametric analysis could them report wrong values. But I agree with you, this should be an option for the user, or at least, for the administrator to configure allowing or not "parametric" surface selection in analysis tools.
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