The champion mechanic is spot on in terms of the ideas behind it. The implementation, and curve leave a bit to be desired. I was skeptical at first, but as Teremus has said many times, its not a matter of just adjusting stats to be more efficient. If you make everything too efficient at the get go, then the faction becomes too strong and stifles room for improvement. I asked Poga in the order reveal stream when the Champion mechanic was revealed something along the lines of 'if x cards leave something to be desired, will we see them be potentially reworked?' and he responded in the affirmative.
Its not a matter of 'if they will rework cards that need to', its a matter of 'when', and that when is in the very near future.
To be quite frank however, I am a bit peeved at the tone you're taking when confronting the developers over their decision to make the champion mechanic. This isnt a matter of right, or wrong, its a matter of subjective balance, and subjective direction.
There is no 'right way' or 'wrong way' to do overseers. There are a ton of different approachs you could take to the faction and still come out with a faction thats properly balanced in comparison to where the other factions are in terms of strength.
The route they decided to take with the Champion mechanic was, in my opinion, an unorthodox one but not one that was entirely on the wrong track. Its like anything else, Magic the Gathering, Yugioh, really any card game you care to make didnt get things or mechanics neccesarily right the first time they tried them. This game is not in the business of releasing a card and then never touching it again. We see cards like Shikana, who Demands Tribute being errata'd when that card was released all the way back in core. I would not be surprised if three years from now we - still - see regular changes to cards that need a bit more adjustment.
Also, 'nerf' overseers? I dont think you understand exactly what the Champion mechanic is, or what it was meant to do. The primary issue with overseers wasn't that they were too strong. Its that the deck was too linear. I remember friend of mine put it the right way back pre-order: ''I literally have a flowchat for my turns''. Overnight after the Champion mechanic and Order release, we saw the 2-3 possible overseer decks jump to at least 6 different unique variants, with endless tech choices for each. Now what needs to happen is not a rollback of the champion mechanic, but a careful review and editing of cards that need a touch more strength, or need to see a bit of a reduction in power.
As for your complaint about not being able to use all the champions in one deck: That was the - intention - behind the mechanic. You're only meant to have a few specific champions in your deck, that are played strategicly. You're not supposed to go 'damn I cant deploy this' when you draw another champion, you're meant to use it as your plan b.
Also the Champion mechanic is exclusive to overseers only. You're reacting so much to this change its cute. Even I had a less extreme reaction at first, lol.