I guess it's all about how people react. Personally when I lose an attack or take much longer on an attack than I initially thought, I don't immediately think that something with that base is fishy and I need to see some concrete data to explain why. I know that the primary reason is that I didn't attack as well as I could have, perhaps I underestimated the base and brought low end troop cards thinking it was a push over base, or really I just sucked balls that attack. All the numbers are available on the wiki forum and you can at least come up with numbers. Top alliances have been doing that forever using spread sheets, calculators and etc. I wouldn't look at the data and think wow they have an extra 3% more research in mortar damage, that's why we lost. If we had only researched another lvl into our offensive coalitions we would've won that fight.
The other thing that isn't mentioned is when you get to see this data. Would you view it immediately after a battle? In the case of war, how about only see it once the war is finished because there's already a replay function to deal with. My lone opinion isn't going to stop this system from going into effect but really, adding new features in the game tends to add just as many bugs or unforeseen issues just like the town center radius problem. No one planned to increase the range, it just happened as some weird byproduct. I know there was no intent there and it's annoying but people are just using more decoys to counter (Assuming you have decoy). There's no way to know for sure any of the data shown is absolutely correct just as the battle replays are not always correct. I really hate trying to study my own attack to see how I could improve and it shows me a path that I didn't even take. It will just lead more people to accuse others of hacking seeing some weird number just as the replays show 100 planes being used but we know that didn't actually happen. I don't know what alliances are asking for this but none that I've heard of.