Ask What is a niche skill where proficiency with a specific type of software is essentially required?

[Brendan]

There are certain freelance services where knowing the general concept is not enough because the actual work lives entirely inside one tool. Motion graphics is a clear example since most clients expect Afer Effects as a baseline, not just animation knowledge. The same applies to BIM modeling in architecture or audio mastering in music production. What niche skill have you come across where the software itself is the real requirement, not just the underlying knowledge?