Stamper, I don't disagree with you - you are clearly very knowledgeable about PS and I'm not - but the level button works fine for this kind of shot. Slightly skewed horizons (a couple of degrees off) are probably one of the most common fixes and it is nice to be able to do it without squandering pixels.
Everyone's workflow and needs are unique. I think of PS as a Ferrari Enzo and LR as a Ford Focus. In my world I don't need the Enzo, the Focus will do everything I need it to do. For now, anyway. As my needs evolve maybe that will change.