To me without reading supporting articles, abuse is abuse which ever way you want to look at it.
It is about control.. Some use emotional, verbal.. Not physical, but each abuse hurts, destroys, brings a person down, belittles and that person loses their ability to own themselves, their control of themselves eventually.
Each abuse is demeaning, and about power of some sort.
When someone takes away "power" of self, the person becomes powerless.
And, in that, they tend to accept the abuse which is what the abuser wants which equals control.
But, emotional and verbal abuse hurts too.. Take that aside.. Where physical can cause bodily harm even death.. Emotional or verbal abuse can equally destroy a person, eventually.. Mentally destroy in any way that abuse is issued.
Only the strong can walk from any abuse..