This papers points out some weaknesses of the solution-adapted process. They have been solved by improving the Newton's method of the flow solver enabling convergence to machine zero at each run of the solution adaptive process. This work also presents the benefits of using metric-based anisotropic mesh adaptation for the numerical simulation of high lift configurations. For instance, we reconsider the CRM-HL geometry of the 3rd AIAA CFD High Lift Prediction Workshop and we obtain a prediction of the lift value similar to that of the x-fine mesh generated with the best practices (206 million vertices) with an adapted mesh composed only of 2.7 million vertices. This represents a reduction in the mesh size by a factor of 75.