In order to answer this question, we need to consider the meaning of “learning by heart” which may mean to learn something so deeply that it affects us on a personal level or to learn with personalizing the effect or quality of learning produced. Although it is important to implement the memorizing techniques and to get actively engaged in the process of learning using route learning, learners need to form a connection with the materials they are learning since our brain learns faster through the process of assimilation which is a process in which the brain integrates the newly learned materials with the preexisting cognitive structures. It has been long proven that personalizing the materials we are learning is more effective than non-familiarized information when we want to memorize something, in fact, learning by heart— also known as deeply personalized learning— can be more practical for teachers since all children, no matter what learning style they have adopted, learn through accommodating and assimilating(personalizing) new schemas. In conclusion, I disagree with this exclamation that learning by heart is old-fashioned. 
In order to answer this question, we need to consider the meaning of  
“learning
 by heart” which may mean to  
learn
 something  
so
  deeply
 that it affects us on a personal level or to  
learn
 with personalizing the effect or quality of  
learning
 produced. Although it is  
important
 to implement the memorizing techniques and to  
get
  actively
 engaged in the process of  
learning
 using route  
learning
, learners need to form a connection with the materials they are  
learning
 since our brain  
learns
 faster through the process of assimilation which is a process in which the brain integrates the  
newly
 learned materials with the preexisting cognitive structures. It has been long proven that personalizing the materials we are  
learning
 is more effective than non-familiarized information when we want to memorize something, in fact,  
learning
 by heart—  
also
 known as  
deeply
 personalized  
learning—
 can be more practical for teachers since all children, no matter what  
learning
 style they have adopted,  
learn
 through accommodating and assimilating(personalizing) new schemas.  
In conclusion
, I disagree with this exclamation that  
learning
 by heart is  
old
-fashioned.