Huh? What's a minor check in? If you're watching a game close up and live, you can evaluate a great deal from first step, pitch movement, hitters handling movement, quickness that could be in question due to a lingering injury, routes on fly balls, time down the first base line, distance covered and how quickly when fielding a ground ball and more. Advanced scouts evaluate in detail what is currently going on with their next opponent.
All the stats in the world won't tell you that player XYZ is in a short term slump due to (fill in blank) unless you spot it. Then you can attack that weakness. No video or stats from a week or month prior will tell you how healthy player ABC, you might want to trade for, is that day. Can he help your stretch run playoff race or not? Is a flaw correctable? Is a guy moving slower than he does historically? It's big business and information is very valuable.