Extrude surface tapered creates divided surfaces

maybe it is widly known…
the Extrude surface tapered command creates a surfaces that are not just one piece but need to be rebuild.
escpecially if you need to use these solids t subtract from another solid.
you get seams that creat problems for a fillet.

Funny thing ist that the extrude curve tapered command (that I just found and actually need more) works fine!
seems thet use a different aproch…

Hi Mirkos, I see that, thanks.