I am not sure the best capacitors today vs 15-20 years ago are in fact better. It seems to me there is now a market for high grade fancy capacitors in the DIY hifi community, and so there are some smart companies who are riding that wave and marketing to that audience.
Dueland, for instance. It would be interesting to hear from people who have been in the high end hifi manufacturing business for a long time, hear their commentary on this. There seem to be some others on this forum who will do modifications to some gear for a fee, using these fancy branded caps and other components. Things like salt used to just be salt. Now there is Himalayan salt, Moldon salt, etc etc. It is still just salt, and before there were better quality and worse quality salt for cooking, the marketing business just had not latched on and did their thing.
Dueland, for instance. It would be interesting to hear from people who have been in the high end hifi manufacturing business for a long time, hear their commentary on this. There seem to be some others on this forum who will do modifications to some gear for a fee, using these fancy branded caps and other components. Things like salt used to just be salt. Now there is Himalayan salt, Moldon salt, etc etc. It is still just salt, and before there were better quality and worse quality salt for cooking, the marketing business just had not latched on and did their thing.