Not commercially viable, hard to stardardized. One can always get those for DIY project but most DIYers would not want to spend that much on one component
We want more of this!
https://youtu.be/2IlW-HX_m_4
Wonderful initiative on capacitors!
Other than listening live, theres only a few ways to find out how capacitors work. A great starting point, no objective statements, just samples for people to listen to.
Almost 60 other capacitors in the lineup as stated on the website