User blog comment:ThePretender73/Using Nen for something else than fightin?/@comment-65.164.197.21-20130118041901

There have been abilities in the series that were not suited for the battlefield, such as Neon's Ghost Writer; however, this is predicting the future. Not recovery. Regardless, I can not imagine that ability useful in a fight.

As far as healing goes, one of Neferpitou's abilities is, although he is suited for combat. 'Doctor Blythe' is an ability used to heal, but when it is in use he isn't able to defend himself a 100%. Someone else mentioned this in the comments as well.

With any type of great ability, such as healing, there would have to be some type of draw back. If a character could heal perfectly in battle at an incredibly fast rate, then they would be invincible. Powerful characters are great, but invincible ones are not. I do believe we will see more healing abilities in the future, though, just not a flawless ability.