I agree, so what's the point in using "well you don't know" as an argument? None of us know the future. None of us really have more of a clue into these players than anyone else. Do I really have that much more insight into Player X because I looked at some metrics on FanGraphs and some other poster just watched them play once on TBS? No. It's all just guess work.
At the end of the day, let's just not take this place too seriously and try to not go after each other so often.