True, although if you remember when he was at his peak (2004-6, maybe 7), all the talk was about how he didn't have any weaknesses. When Nadal came along, everybody said he just had a problem with high-bouncing balls to his backhand on clay. And that was partly true, though it's also true that nobody has been as adept as Nadal at forcing him to play neutral rally backhands.
Only Fedtards talked about having 'no weakness' - his BH topspin was always a weakness, from his early days people were trying to beat him by pouncing his BH. It's not 'easy' to do, because he is very quick (extremely, in his younger days) and has a great defensive BH slice. But that slice doesn't work vs. Nadal on clay (and not even on grass since they made it slow as ass), and against other people who are great movers and have rock-solid backhands (very few of those).