I try to understand this subject.
It makes sense to lock your mobile since it contains a lot of private information - like contacts (some people store a lot of add. info with those contacts), social media, photos, email etc
Your camera.....it has a memory card with photos only. Let's say the camera get stolen. The thief will open the memory card slot and has access to the photos. A pincode does not prevent it.
A pincode that prevent the use of the camera? You think that the thief will bring it back? He may throw the camera or try to sell it for parts. But you will not get it back.
A thief knowing that stealing this kind of camera doesn't make sense because it has a pincode? Most will not know that and try to steal it anyway.
Even if you have a pincode (or fingerprint scan) it doesn't bring back camera or photos. Yes, photos...it would make sense to encrypt the storaged photos so a stranger would have difficulty to access them. But encrypt photos while they get stored on the memory card will slow down the burst speed - not something we want.
A good insurrance will help...(not bringing back your photos though)