I'm sure the Yatzr tool is great. I never used it but I know it's capabilities. I am grateful it exists. If it didn't, these worlds would be emptier then they are.
I believe I've gained an advantage over time by using the sites tools, learning the filter combinations, and discovering the best filters for certain or specific situations. I could be wrong, maybe I haven't gained an advantage. But what I will say with 100% confidence is that the Yatzr tool won't make you a better coach, only more efficient. If you think that's cheating then there's not much more I can tell you. But if you do come around, I'd advise you to keep on not using it and you might discover some things.
Bottom line is the Yatzr tool is GD positive so I give it the big thumbs up.
I don't go back and forth, so that's pretty much all I've got to say about this. Peace