It really depends on how long you wait before making the students sensitive to these issues.

Wait 6 months or 1 year, and you've given them time to gather sufficient experience for motivating a more mindful way of working.

Wait 3 years or more, and you've just taught them bad habits.

I'm tired of interviewing candidates who were supposedly trained extensively in programming, asking them "how do you approach making quality software?" and hearing the usual "oh, I indent my code and write a lot of comments" as an answer.