OTOH, we also don't really see startups making products to facilitate making art. My field is theater, and we are served by a lot of tech companies, but none of them are SV-style startups. For starters, nearly all products relevant to our work are hardware, which is already hard on the SV infrastructure.
It's also very easy to tell when i.e. your light board was made by a bunch of software engineers reading a specification, rather than a bunch of lighting designers. The latter is vastly preferred by the market. But lighting designers have interests and hobbies outside software engineering. They don't spend their spare time writing code, they spend it making theater. So they're not going to have extremely active GitHubs or be "passionate" enough to work 80 hours a week. Silicon Valley does everything in its power to make sure people like that don't get hired. So the corporate 9-5 workplaces eat its lunch, because they can attract talent that wants to continue doing art on the side.
Finally, as a broader point, the HN community (which I take to be pretty representative of the startup community) is extremely proud of its open hostility to non-STEM people. Hardly a week goes by without a circle-jerk about how all non-STEM college majors should be disbanded and the people in them are all subhuman failures wasting their time and taxpayer money for not going into STEM. Artists are fundamentally people who picked a career that's not in demand, and HN hates them for it. It's not surprising that the startup community isn't attuned to the products they want to buy.