On my truck specifically, I check the oil level BEFORE I drain the oil. If it isn't where I left it, I would know something was wrong.
I also check it after filling, giving it time to drain down from the heads, but before running the engine. The dipstick won't show accurate for a long time after running.
The book calls for 15qts. I only run 14. I want the oil level to be in the center area of the crosshatch marks. If it makes oil, I want to be able to see that. It doesn't use any oil, and it doesn't make any, so far. Occasional oil lab tests keeps me verified and in the loop.
I will admit to becoming complacent about checking oil level between changes. Something about checking time after time after time, for years, and never needing to add any, makes me complacent. I'm more likely to just look underneath on the concrete every day to make sure there aren't any drips.