Prolonged qTC

Hey all, recent graduate here. I’ve been thinking back on some residency experiences and one that confused me in regards to medication induced qTC prolongation. I remember while in training many of the attendings on the teaching service emphasized checking an EKG to assess for baseline QTC prior to giving select medications. My last few months there, I worked with hospitalists that were not on the teaching service. They all seemed annoyed that I was checking. One even directly me to ‘quit doing that.’ They never explained. Was what I was taught wrong? Am I missing something? Thank you for taking the time to answer.