Still opening Legends Rise packs using Daily Login.

It seems like once we acquire the coppers and silvers of an expansion set, an extra 20 packs isn't going to achieve anything, because

1. I'm F2P and therefore only playing one class.
2. One of the two legendaries in this expansion for my chosen class sucks.
3. Therefore, there's only one card in the entire expansion set I need, and it makes no sense to open 30 packs in hopes of getting maybe one copy of it.

Instead, it makes far more sense to open packs for an expansion I already have cards for, because it increases the odds of me getting vials, which can actually be used.

Have y'all been doing the same strategy?