The Avenger change is fine. Prior to 11/17, Avengers were more or less required to take Leather at some point for CO (despite all Avenger Armors being cloth), as it was Too Good Not to Take. Now they aren't.
And since Avengers have very good AC (hide-equiv with an AC stat as secondary, and a +1/2/3 AC feat) and fighter-level HP ignoring con, there's nothing to worry about here; Avengers were stupidly sturdy strikers prior to the fix, and are now very sturdy strikers -- with one more feat to throw around rather than having YA "required" feat choice.
And since Avengers have very good AC (hide-equiv with an AC stat as secondary, and a +1/2/3 AC feat) and fighter-level HP ignoring con, there's nothing to worry about here; Avengers were stupidly sturdy strikers prior to the fix, and are now very sturdy strikers -- with one more feat to throw around rather than having YA "required" feat choice.