It's time to change the "Locked" mechanic
Way back in the day, having champions be "locked" to content was important. It forced us to use some strategy about who goes where, and it helped create a need/desire to grow and expand our rosters. We couldn't just max a few 4*s and use the same three champions for everything at once.
Now, however, this is not the case! AQ enemies change every week. War opponents change every war. Some champions inherently need specific counters even before factoring in their nodes. Cav difficulty and act 7 strongly encourage using certain classes and/or champions with specific abilities. Not to mention special challenge quests, variant quests, etc. Having 11 of our champions locked to AQ/AW is no longer forcing us to grow our rosters as much as it's forcing us to wait to work on solo quests and monthly events.
We now have lots of other reasons to need to expand our rosters, and in the current state of the game, having champions locked to AQ/AW is really just incentivizing us to NOT participate in AQ/AW. Please consider removing this outdated feature. Thank you.