All the companies I've had the privilege to represent in the last 35+ years are in the engineering business -- not the software business. As such, a wide spectrum of challenges are realized every day, be it 11th hour surprises like "can you do some seemingly impossible task to these 5,000 drawings by Thursday?", issues with third party drawings and models to mass scale re-branding. Ad-hoc solutions typically need to be penned and executed within the hour. LISP is, and will continue to be the appropriate solution in these cases to the tune of ~ 1/4 million lines of code per year for years to come -- regardless of the fact I would prefer to work in C# and Python. Cheers.