In this case, those overhead bins were already full. (I try not to be a gate louse, so inevitably we're usually the "last" in Priority line if doing FC/SkyPrioritiy/whatever).

Generally I try to avoid taking "other people's" bins mainly because if there's not enough room for my stuff, I take up room in the other bin, then other passenger comes along and they can't put their stuff in the bin that I put my stuff in and they can't put stuff in "my" bin either.

Kinda like when you get on the plane and you see someone put their stuff in the first bins (even if single class cabin) and then walk all the way to the back of the plane. Now when "front" row (regardless of whether it's FC or not) passenger comes in, they have nowhere to put their bag and inevitably the FA has to put it all the way at the back (where original passenger "should've" put their bag). Now when de-planing, person in front has to wait for everyone to leave and then get to back of plane to get their bag.

But good to know that I followed "proper" rules. LOL!!!