You are not considering the time, money, and effort they have already devoted to the changes. Also, Rey is who YOU want to protect, but others might want THEIR investments protected. Where would it end? Development schedules are created months in advance of release. (I am guessing) You cant stop progress.
You are being perfectly clear. You want to protect your time investment. If you dont like the changes, complain. No sense future tripping with no hard evidence.
I think it is premature to label them nerfs just yet. I dont remember any claims of a blanket adjustment. A balance pass will change some toons for the better, some for the worse, and some not at all. There is not enough info for informed speculation yet.