I don’t see anything wrong with BoC shots as long as it’s their own photo, correct date and time, and not so horribly blurry as to be un-identifiable.
I upload plenty of pictures after transferring to my computer or directly from my phone that are grainy or pixelated, no back-of-camera photo needed. I just suck as a photographer!
I don’t think menus or camera showing up is any more of a problem logistically than, for example, uncropped photos where the organism is a tiny part of the scene and there is a lot of stuff around it. Aesthetically, it’s not the greatest, but iNaturalist’s purpose isn’t to be an art gallery. I’d be in trouble if it was.
Copyright violations that are not BoC shots are common – photos of posters or books, stolen photos off the internet, etc. I think it’s just as easy to click download on someone else’s photo than to whip out a phone and take a picture of the computer screen.
I don’t think that BoC photos are more likely to be incorrect in terms of date and time, to be honest. I have found many inaccurate location (or date) photos that are not BoC shots.
Many cameras don’t have GPS, and phone-linked tracking apps, if they work at all, can be battery-draining and inaccurate. That means many people are relying on memory after they’ve come home, and taken the time to transfer their photos to the computer, edit them, etc.
Most IDers can’t check all observations they ID for location accuracy, I’m sure. If it stands out as an out-of-place species (or subspecies) or with a habitat that obviously doesn’t match the claimed location, I’ll notice. Without those obvious clues, for many observations’ locations we just have no way of knowing whether they are accurate or not. Sometimes it takes me quite a bit of sleuthing to verify that a location or date is inaccurate, with identifying plants in the background, checking the weather history for the location and date in question, using Street View on Google Maps to scope the location for the photo background, etc. There are some observations that I am pretty sure are incorrect, despite the observer’s claims that they are, but I just don’t have enough information to mark the location as inaccurate.
Though I haven’t uploaded them, like @paul_dennehy I actually use BoC photos to record accurate locations of photos I’ve taken with my camera, since it doesn’t have GPS. This means that my BoC photos would be more likely to have an accurate location. Also I often have to set my camera’s date/time manually when I travel, while my phone updates automatically. I have forgotten to do so before. I sometimes upload these with my photos just to grab the location data so I don’t have to copy the latitude and longitude manually, then delete the BoC shot before I push “Submit”. Some day, I will forget to hit delete, I’m sure.
I think there a lot of reasons to upload BoC photos, many mentioned here.
Excitement is probably the reason I can imagine I might do so some day. If I see a really really cool organism and just really want to upload it right now and not in a few days when I can get to my computer and do it properly, I might have to. Or if I see something I don’t recognize and really want to get an ID as soon as possible.
Or like when I was on a trip overseas recently and spilled an entire mug of tea on my laptop. You can bet that during the period that I thought it would be a long, long time before I had a computer again, I was trying to decide whether extremely low resolution photos transferred to my phone from my camera via Bluetooth or BoC shots were a better option for getting my photos onto iNat.
Luckily for everyone who has to be subjected to my observations, my computer dried out enough that it started working again about 24 hours later.