So you're basically saying that you depend entirely upon the airline's scheduling software to determine whether you are legal or not? Definitely not the answer I would want to give if the fed was asking why I exceeded my flight/duty limits.
No, I look at my schedule, which has my duty in time, overnights, flight times, etc. As a start. To make sure I'm legal I rely on the numbers I record on my printed trip sheets. It's not that complicated.
"I dutied in at " x" today. I turn into a pumpkin at "x" today as long as everything goes according to plan. Of it doesn't, I'll have to have another look at things. "
Edit to add: I just don't care that much about .2 or. 3 for a gate return in my log book. As for what's on my trip pairing I print out, it reflects every minute the brake was off, because to a fed, that's what matters, and to my QOL, that's also what matters.