On most smartphones, messenger apps like WhatsApp are constantly open, but they shouldn’t be seen as an equivalent replacement for the phone’s own camera app.
It often happens that you are reading or typing a message when you notice something that you’d like to photograph or you need to send a specific photo with the message. In that case, it’s easier and quicker to call up the camera within the app itself.
However, you shouldn’t do that if the picture is intended to be more than just a fun snapshot with a short half-life.
That’s because when taking a photo, many messenger apps – as well as other apps – lower the resolution, strongly compress the photo or for other reasons do not achieve the same image quality that the phone’s native camera app would achieve. – dpa