How many lessons do they need? It's been the story of their entire career...
Actually they were skating well early in their career. They were not given good programs. Their coach neglected them. I have seen them skate with freedom at the 2016 Olympics. They placed highest among the three Russian pairs there. The other two pairs had won Olympic gold and silver, but could not deliver at the 2016 worlds when they were healthy. T&M were better.
In her interview Zhenya described her struggles during the Olympic season. They did better this season. So they did learn from their Olympic season.
Finally, Sui Han did not suddenly become what they are. They went through their learning curve too.