The reason why many daughters-in-law are not willing to make an effort to please their mothers-in-law is that even if you do, you won't get a bit of attention from your mother-in-law. And the more you please, the more he will feel that you are rushing to marry his son, afraid that he is not worthy of her son, so deliberately to please him. Such a mother-in-law will not empathize. And there is always a sense of superiority. So slowly there will be no daughter-in-law wanting to please their mother-in-law.
The mother-in-law is just the husband's mother, he has no relationship with you, not to take care of you for a day. So there is no need to please your own mother-in-law. People's heart for people's heart, if your own mother-in-law is better, then you are also good to her. Nowadays, the biggest conflict after marriage is the conflict between mother-in-law and daughter-in-law. It is because the mother-in-law is always confused and wants to meddle in her son's household affairs. But what he should understand is that since his son is already married, it means that there is a new family, and this is the time when he himself shouldn't meddle in it, and his son and daughter-in-law can handle this matter very well. And once one meddles in their affairs, it will cause family conflicts. Let his son caught in the middle is really not a wise move.
There are also more and more mothers-in-law who feel that they have raised their sons all their lives, and in the end, they are good to another woman, and they will have some imbalance in their hearts. That's why they target their daughters-in-law at every turn. But nowadays women themselves have the ability to give themselves a better life, and after they get married they also work and they take on the burden of the family. And after they have children, they can afford to give them a better life, and they can find a nanny who doesn't need them to take care of them. Since you can't use your mother-in-law everywhere, there's no need to deliberately try to please her. Especially since pleasing doesn't get you anywhere.
I think the other most important reason for not wanting to please the mother-in-law is because the mother-in-law herself is not easy to get along with, she is too strong. Everything in her family has to be at her beck and call, so she also wants her son's family where she has to be the boss as well. This is not going to end well.