you don't need it in the sense of like, having a portfolio with drawings, but unless you are aiming to go a very technical route, practicing drawing will undoubtedly make you better. there are obvious things it helps with like sculpting, designing, texturing, but just as importantly, drawing is fast and makes you observe.. it helps you develop your artistic eye, the sense of if something looks good or not, as well as your creativity. 3D is slow, it takes longer to create something, which imo stunts the speed of your artistic development. furthermore, there are a lot of technical things to think about. so you can end up running into a wall as the above poster said. so it can potentially help even if you are doing more technical things, just indirectly.
like how many times do you see technically decent people doing the same old shit over and over based on other people's already generic concepts? or animators whose lack of compositional and storytelling abilities make their shots instantly forgettable? or TDs who have some technical skill but don't make anything interesting or actually nice to look at?