To me, the room for improvement isn't just in the chains; but perhaps more importantly spotting the ball correctly. Each tackle has a certain amount of arbitrary placement (some more than others, of course) which over the course of downs/drives makes the chain measurement precision kinda pointless.
Like you though, I think there are great areas of advancement that could be made soon. You cant just flash a laser line across the field (it crowns and the first person to step in front of it turns it off). The microchip in the ball could be a great use too; just not sure how to integrate it with "down by contact".
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