Yep often they don't see aesthetics/usability as a feature, and sometimes even have a grudge against it.
For example, Blender pre-v2.8, many many flamewars belittling people who wanted something usable, akin to calling them shallow/superficial Untermensch who "don't understand" Blender's supposedly genius but strange design choices at that time.
I suppose that's why most aren't capable of making a product and are relegated to being an employee or unpaid open source employee.
