Haha, ok, no worries.
Frankly I skimmed over that phrase for quite awhile when I first came to reading reviews of hi-fi gear, so I don't assume everyone else knows what it refers to in that context as I was willfully ignorant of it for some time myself.
Gah. This is impossible to answer really since we all have different preferences.
The Arya's are highly capable headphones. I felt that way when I first got them and still do. They were the first $1000+ purchase for me in headphones and showed me what high end phones can do (rival good speakers in many respects). (And they finally convinced me that it was ok to spend that type of money on these things).
But ever since I got them I also felt something was off about their tonality. Something did not satisfy even as impressed as I was (am) by their technicalities. (I tried to remedy this with EQ and various amps, which, having done this before with speakers, I should have known better than, and of course it did not work: you can't fundamentally alter a transducer's sound with making changes in the chain behind it ime). They simply aren't engaging enough for me and their mids, especially vocals, are too distant/recessed.
So if you have the Solaris and like that presentation then you may not, like me, like the presentation (at least as much) of the Arya's, which I have tried to compare/contrast a bit with the Solaris in my earlier post, as it is quite a bit different. Or maybe you'll like it better; you'll discover this more analytic/clinical, distant, "intellectual" approach with more sound stage is more to your preference.
I will say that the Arya's are very comfortable if that's part of what is motivating your decision; however I also find the Solaris 2020 very comfortable. I can have them in my ears for hours and hours on end without issue (I have medium sized ears). I actually listened to them for over 9 hours the other day with only a few very short breaks for routine things like making short business calls or using the restroom. I didn't tire of them in my ears, nor did I fatigue of their sound with different genres (but mostly more "in your face/intense" music like rock, metal, energetic jazz, etc).
Really there is no way for you to know what to do here outside of trying the Arya's for yourself. That's the best advice I can give.
EDIT: Just did a tiny bit of a/b'ing again with the Solaris 2020 and Arya's and there is just something off to me about the Arya's tonality, especially with pop/rock. They sound sharp, etchy, kind of dry, the highs are almost "metalicy", and the vocals especially are thin (if articulate). Beyond all that, they just don't engage you, draw you into the music. You definitely feel more like an observer, a clinician, overviewing and critiquing the sound instead of "living it". That's partly due to their tonality and partly due to the almost "you are hovering above the sound stage" instead of being immersed in it presentation. They still remain very good headphones, however; again, the technicalities such as imaging, PRaT, decay, instrument separation, etc. are all good to very good.
Wow, thanks so much for your detailed feedback, it really helped me a lot with my plans in purchasing the Arya. Really appreciate the intricate details of your experience with both solaris and arya. Since i already got the Solaris and is spoiled by the accuracy and realism to almost any tracks/songs thrown at it, it's difficult for me to return to a lesser (listening experience) headphone or iem. Perhaps i should consider looking again into other open back hp options before i pull the trigger on Arya. I was 90% into buying them before your comparison and opinions of the two (which is a big help) since there are no audiophile gear/ sellers around where i live, and is entitled to blind purchase from other countries via online. This is why most of my purchase decisions are based on reviews here on headfi and other sources. Right now, i prefer to have a good sound stage open back headphone and should be similarly capable to the SQ of Solaris, but mids shouldn't be recessed (as you mentioned for Arya). Will look more into other greater options. Thanks a lot!