darTZeel only makes analog products except for one integrated amp with a dac in it. the ’zeel’ 50 ohm interface is strictly analog only.
Herve Deletraz of darTZeel wrote an article published in the Sept 2001 issue of Stereophile about Impedance Matching in audio. it’s quite technical. but if you doubt the logic of the 50 ohm BNC advantage for analog interconnects, then you should have the tech knowledge to follow it. it’s serious.
https://www.townshendaudio.com/PDF/Impedance_matching%20deletraz%20paper.pdf
he wrote that article before he launched his audio company where he applied the principles mentioned and included the ’zeel’ BNC 50 ohm interface in all his products.
i have owned darTZeel amps and preamps since 2005 and always used ’zeel’ 50 ohm interconnects. compared them many times to conventional interconnects and always preferred the ’zeel’.
you have a right to your opinions, but there is real science behind the 'zeel'.