I can't play support without Sightstone anymore

I used to go full AP Soraka (with gold income item of course), but started to buld Sightstone and more utility and now my AP build seems weaker, we have no vision etc. Even in normals I go with my supp build. I guess it's good but do other support players have this feeling too? **EDIT**: Seems like a lot of people can't read here so I make it as clear as possible: I USED TO build full AP -> I don't do that anymore Since I started to build Sightstone I made it my habit, and when I don't my team lacks vision which is BAD. My OLD AP build seems weaker now for me, because we have no vision, shields etc.
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