Hey JJJ
Putting a good offense system together it's a matter of finding out how to win as fast as you can. And for that you need to get creative, you need to invest time and test stuff for hours. No point doing that to try to find and edge if others will be able to just see and copy it.
This might be an issue only for people who are super competitive in Arena, but all of them (I think) have agreed this was a bad decision.
And another thing, people like Nicko and HomemLivre, guys who put great defenses one after the other, they'll tell you that knowing how you get attacked makes little difference helping figure out a good defense. It's about understanding current meta and doing lots of tests.
I used to think like you, and info on how we get attacked might be good, but they should be put in a group, like most used toons, win rates etc. Current system only exposes others offences.
cheers
gmac