Agreed. I just received a pair about 5 days ago and have been listening to them alongside my primary open headphones (2014 Audeze LCD-2 with Fazor), and the Aeon is indeed comparatively light on bass quantity, but certainly not quality. Unfortunately, I don't have the budget nor live in an area where I can throw a ton of comparisons at you with top-end gear, but here's how the bass compares to the LCD-2 with my setup:
The LCD-2 straight up has thicker, punchier bass, no question. In the song Angel by Massive Attack, there's a heavy bass line throughout. The LCD-2 literally rumbles on your head and the bass is both felt and heard the entire time. When the bass starts really punching just after the 5-minute mark, it physically hits the side of your head (in a pleasant way, mind you).
On the same song and sound levels, the Aeon Closed does no such thing. You can certainly hear the bass loudly and clearly, but it lacks the physicality of the LCD-2. Instead, you get a much cleaner sound, and you can hear the intricate details and texture of the bass in a way the LCD-2 can't match. Instead of being the main focus of the song, the bass becomes a beautifully balanced part of it, and you become immersed in the rest of the song's sound and detail instead. At that aforementioned 5-minute mark, you can feel a little bit of the bass punch on the Aeon Closed, but not nearly to the degree of the LCD-2.
I should also mention that the Aeon Closed is much more power-hungry than the LCD-2, and maybe the Aeon's bass does have the potential for such physicality that my amp just isn't strong enough to bring out. For reference, I'm using a Schiit Modi 3 DAC paired with a JDS Labs Atom amp.
All that said, I'm totally in love with the Aeon Flow Closed, and to my tastes it does most things better than the LCD-2, despite it being a closed back headphone. It's given me a totally new appreciation for my music library with its incredible presentation of ALL parts of the sound spectrum, not just the bass. I think my next step is to grab a AAA THX 789 amp when it becomes available again and see if I can't give my Aeon's some more amping justice.