…does not matter if it is DVD or single video file. It is lazy coding… simple as that. should have a fully watched icon.
I don’t disagree that a FULLY watched icon is possible for linear, single-stream material.
But it’s just not possible with DVD. Remembering where you STOPPED is a trivial task. But knowing if that’s the END is a whole different ballgame.
If you’re thinking that it should just mark as being completed if you stop near the end of the FILE, then for many DVDs, you’d be completed as soon as you start it, because most of the opening sequences (trailers, FBI stuff, Studio logos, etc) are at the end of the file, but are played at the beginning. It’s also completely possible that you NEVER reach the end of the DVD, because DVD authors often but unreachable content at the end of the file as a form of copy protection.
DVDs are non-linear. About the best you could hope for is a menu option for “Mark as Complete” or something.