Computed property vs overhead

computedProperty.js

@track arrayHasItems = false
@track theArray = [];

//Computed
get arrayHasItemsComputed()
{
  return this.theArray.length > 0;
}

//Not computed
addArrayItem(item)
{
  this.theArray.push(item);
  this.arrayHasItems = true; //Overhead
}

removeArrayItem(item)
{
  //.. Do the actual find and remove
  if(this.theArray.length > 0) 
  {
    this.arrayHasItems = true; //Overhead
  }
  else
  {
    this.arrayHasItems = false; //Overhead
  }
}

someLogicWhichMightOrMightNotAddOrRemoveArrayItems(items)
{
  //.. Do some logic
  // Depending on what happened in this method, this.arrayHasItems needs to be manually updated //Overhead
}