On Android, you can assign volume buttons to be there shutter button. You can also open the camera at anytime even when locked, by double clicking part button.
Yeah, and none of those options work as well as the camera button in the old Nokias (I was a happy Nokia user as well, but they missed the boat with their software, even though their hardware was top notch)
This is a matter of taste. It works better for me. I have used phones, Sony's specifically, that do sport a dedicated button. I never used them because I'm not used to the location of the button I use once in a while. The power button however I use multiple times an hour so I can put the phone into camera mode and take a photo with my eyes closed.
