Why not use varchar(max)?

Question

I\'m a bit old school when it comes to database design, so I\'m totally for using the correct data sizes in columns. However, when reviewing a database for a friend, I notic

Answer 1

The diff is in next:
VARCHAR(X) can be indexed and stored in the MDF/NDF data file.
VARCHAR(MAX) can't be indexed because can reach high volume and then will be stored as a seperated file and not in the MDF/NDF data file.