Hi,
I agree the two are united.
What I have seen is an exclusion of sanctification altogether from thinking in this way (and I give the popular understanding):

"We are justified, therefore our sin has been dealt with. Thus there is no need to deal constructively with sin that we may have committed before we were saved. Any "destruction" brought on us through that sin is now abolished in Christ."

But to me this confuses the distinction between the guilt of sin and the destruction wrought in our lives by sin. we are simply not made "whole", in the sense that we are instantaneously restored to the perfect image of God, at conversion. That restoration of character takes a lifetime.

I had the unfortunate episode of teaching on this process of restoration in a "good" Bible believing evangelical church and being told I was a heretic and "denying the gospel" because, as far as they were concerned, I was denying justification. I agree with you that they probably had a truncated view of justification but the elements of their doctrine were probably essentially right on justification. Just they had majored so long on that aspect of the faith that the whole concept of sanctification had slowly been corrupted in their thinking.

John B