When you have a 1.9 second nearfall, how do you know it's 1.9? How do you know it's not 2.1? Did you time it? Do you hold a stopwatch when you ref? Exactly. 1.9 is NF because it's so close to 2, the difference is not felt by any party involved. Welcome to wrestling. Where a lot is fluid. It's not really subjective.
Bottom guy should have one burst of effort of time to get back out of criteria to avoid the Second swipe but there's almost no way that the bottom guy's second burst attempt to belly out beats the ref's second swipe. If a guy gets 2 attempts to burst back into prone, he's most likely been on his back for 2 seconds. Hardly contestable. Exception when wrestler was going to his back anyway but used momentum to attempt to roll through which is not a true attempt to get off his back since the roll started before criteria.
Now this is probably an 85% accurate template on testing if there was nearfall there, especially if you're out of position. But if all looks normal those close calls are going to end up being awfully close to 2 seconds. Even painfully close. Are you going to be sure that your assessment of 1.89 was that of greater accuracy than the tilt in question or whatever it may be? This is real stuff. To be honest count me as always being +-.35 which means I can't guarantee you a precise 2 second mark, sorry. But I can tell you that I know when a nearfall was scored and that can produce a stable calls.
The problem really is the 45 degree rule. I don't get why it has to be so complicated. Make it 90. It's not unsafe. It scores more points. If you go past 90 you should lose points anyway, why not? Are there cons to this? Maybe I can't see them. I think it has the potential to clean things up a bit.
Okay digressing too much. My original point is this if it's microscopically razor sharp, let's round it. I don't think any coach would go "THAT WAS 1.987342795 SECONDS". I couldn't tell the difference between 1.9 and 2.0 and I don't expect anyone else to either.
Another good example is counting back. Sometimes I know that I start my count late because things happen fast in wrestling, so I'll start at 2. I'm still thinking. When I realize I'm late that's second one then you get ready and you swipe. That's second two. I cannot get every first swipe that happens on the mat with my hand. I can't. So a lot of my first hand swipes are the 2 count. I never see that. Every first swipe of every ref is always a ONE. Maybe this time I just suck when it comes to this but I know that I miss the first NF count maybe 20-25% of times so those times I recognize where the ONE is and I can time the real 2 in the situation. But I don't know anything I'm just an angry guy on the internet. But really if you ever told me "but coach it was 1.9 seconds so no nearfall" I would gift you with the Mercedes of all stopwatches