Hey Brandon, a lot of users have written to us about this particular thing, on how it is not so convenient. They were reviewing each episode just to update the progress.
So thought I will clarify that here. The thing with TV progress is that it is always at the last episode or season you reviewed. So you can review the last episode or the last season you watched and the progress will be updated to that.
Moving forward, we will show one more option when you swap right on a tv show in watchlist just to update the progress.