Hi Nikola.
the other thing I want to mention is that pivot arms produce more resonance at the bearing. Bruce has actually measured this and documented it in the manual.
Now I base this on my personal experiences as a music lover / sometimes audiophile :^)
The most resonance can be heard in the bass.You need to get the bass right in any room. If someone wants to call this resonance - distortion - feel free. Air Bearing linear trackers produce less distortion - less resonance.
This means the overall room setup like speaker placement used, may need to change to satisfy some, because you are dealing with less distortion. Those that make comparisons and never move their speakers to accommodate the two pivot and air bearing designs, are not comparing properly. This can prove very difficult in some rooms if the speakers weigh 200 lbs. Especially with older audiophiles who have moved their final speaker to its resting place, and now focus only on the small components/cabling, etc....
Everything in audio is fixable with an understanding of ones’s overall room setup. Those on the forums especially Professionals that say the bass lacks on an air bearing - they are not focused on the overall room setup.
fwiw
I shared private emails with your friend Daniel. Dertonarm. He was very helpful when I was researching the Verdier. When I changed the topic to the ET2 - as you know he owned many tonearms, I discovered his preference was to go against the ET2 manual instructions and place as much weight as possible, close to the air bearing spindle. With the ET2 stock design - this produces the most resonance, and the most ill defined bass in my rooms. If you see him remind him of our conversation.
Cheers Chris