Crown thinning is a good way to let light in to the crown of a tree and is used quite regularly on fruiting trees as these types of trees benefit from having an open sparse crown and tend to get a better crop of fruit due to this.

When a tree has a crown thinned a tree surgeon will also tend to remove any crossing or rubbing branches as these branches will rub on each other creating wounds, however if these crossing branches are using each other as support it is advised to leave them as it may cause more harm than good.