Maybe pointless to you, but not them.
Nah, they are doing what they like to do. You're assuming that they only want to hear music reproduced accurately. Like many hobbyists, they also want to play and experiment. Audiophiles are no different from other avid hobbyists. I have a friend that collects classic cars that are 40 and 50 years old. They cost a lot, aren't faster that what's available new, don't handle any better, are not more comfortable, far less safe, pollute more, are missing tons of technology and have reliability problems due to age. But he has a lot of pride in those cars and they bring him great joy.
Same with photography buffs and their gear. More than once my wife has bought expensive kitchen items that have been maybe used once. My sister is an avid quilter and her entire basement is filled with expensive sewing gear. Pick any hobby and you'll find those who spend a lot of money on it that leaves other people rolling their eyes.
They don't want to be "re-educated" by you or anyone else. You're wasting your time.
BTW, I happen to have an original E-30. Great DAC for the money.