Stills are a little easier though, and probably more importantly, they're way less intrusive than full-on filming. There's just something nerve-wracking about knowing everything you do is being recorded. I wouldn't want to subject a team to that.
I'll also note that we nailed down expectations right at the beginning for what was on and off the record. I have a bunch of much goofier pictures, for example, that won't be getting out ;)