In joinery the fit of your pieces is like the fit of your shoes on your feet. If you can toss your shoes off your feet as you hit the couch, too loose. If you shoe horn them in, perfect. A good fitting joint fits snug. No pounding together but it shouldn’t fall apart either. It’s a balance you learn to achieve by sneaking up on it. Learn to use your shoulder plane and you’ll be happy no matter how you cut a tenon joint. Finesse the fit.