Workout and game pop times are different. But you either compare workout times or game pop times. You do not compare high school workout times to professional game pop times.
One thing for sure... Professional catchers and high DI level catchers have quicker "game" pop times than most catchers below that level.
No matter how you look at it... all runners are not equal in the time it takes them to get to 2B. All catchers are not equal in the pop times to 2B. The quicker the catcher is (pop times)... The better chance he has of throwing out the runners that get there the fastest.
Throwing out slow runners is not very important in pro or high level college. Those guys seldom try to steal bases. Accuracy is very important... The tag is very important... But if you can't get it there on time... Accuracy and the tag mean nothing!
The pop time means everything. That is why every scout in baseball times it! They are not interested in how many "slow" runners a catcher throws out. They want to know if you can get it there quick enough to throw out those who actually steal bases at the highest level.