All I can say is that for me, it did not get much better with physical sobriety.
The alcoholism was masking so much more. They have to work so hard to be healthy and present. It is not a magic bullet. Someone who drinks that much will have a lot of work ahead of them, and so will you if you stay.
I can only speak for my experience. I know it's not that way for everyone.
Good Luck. Keep moving forward.