In my opinion you get a great view from up top. If you are an OC the top view helps with game day alignments, coverages and depths of the 2nd level players. You can also find the game day "human tendency" Meaning my Jimmy is better than your Joe, so run the ball here or throw the ball there. Or a certain player over runs the flow of the run or jumps a given pass route, Thus you can make your adjustments accordingly to capitalize on these areas.
As a DC it helps to know offensive formations, depths, and alignments. I will give our up top coach a list or I will verbalize what to look for and to let me know how the offense flows and their sub patterns or packages they are utilizing on 1st and 3rd downs. And it also helps when we have a weakness on defense and need to make a change due to a player being overmatched physically or dare I say due to lack of effort.
So to reinstate my opinion... Up Top Is Good