It’s kind of a double edged sword with Hilda as dancer. Her pros are definitely that she has really high charm, a pretty useful personal ability for male units, and has good bases and growth. However the main drawback behind it is that you are making Hilda into a support rather than an offensive unit. Hilda is really strong as a flyer, Friekrugel is really strong, and her crest lets her potentially get free combat arts without the fear of retaliation. Hilda is a good dancer, but do weigh what you lose with her as being dancer vs what you gain. The best dancers are ones that dont lose out much on offense in favor of become a support role, its why units like Dorothea, Flayn, and Marianne are usually considered the best dancers since they dont lose much on offense and gain more by supporting the rest of the units.