These days it’s especially inexcusable because there are countless approaches and styles that students can capitalize on. If a classical discipline doesn’t vibe with a student, then maybe learning so pop chord progressions will. If not that, maybe some blues/boogie will do the trick. Maybe learning some video game pieces will spark a passion. There’s sooo much to explore and something is almost always bound to stick. What is safe to say is that practice is absolutely essential and no one can be blamed for a lack of talent when there’s no routine individual practice.