Top things that prevent me from 'de-googling'.

Storage costs. I've no idea where to put or how much it would cost for photo/video/docs/email storage.

Email. Self hosting email is terrifying because email is a magic black box. What email service will still exist in X years. Moving email address is a ballache.

Secondary things.

Some of the software is damn good. Especially Maps, including the privacy violating elements, which I've found useful on numerous occasions.