Too Long; Didn't Read
Designers defend design tools the same way a fanboi defends tech companies and their products. Framer & Invision serve the purpose of a prototyping tool primarily but still can be used for designing the prototypes. Using a design tool isn’t a skill. It’s just good practice to display them in your portfolio to depict how strong you’re with the tool. The tools are developed and maintained by big companies which don't care about your opinion when adding, removing, or changing a feature in their product.