The danger of the term is that people think you mean clenched-teeth acceptance. It's not about submission. It means loving your partner as a package dealwith no line-item veto. Marriage often involves completion of ourselves. In the ideal scenario, over time I would become more strong, and she would become more gentle.
Every characteristic has an up- and downside to it.
But if you learn to approach each other with acceptance and empathy, you can create a collaborative context, and often people will make spontaneous changes. Acceptance focuses on the person you have more power overyourself. Secondly, the process that leads to acceptance has the side benefit of making you feel more connected to and intimate with each other. And sometimes, when that occurs, people are more motivated to make some changes themselves. Those are the cures that are worse than the disease.