You're kidding me. This makes zero sense.
I want to clarify: these "SxS" cards do NOT fit in the existing SxS slot?
I'm not talking about being recognized. If they fit, being recognized will come later in a FW update.
New AXSM cards cannot even insert to the existing SxS slots for they are too much thick.
Regarding the benefit of new AXSM cards, I found some. The new AXSM's download speed is much faster. It's roughly 55min (old) vs 35min (new) for downloading full card of raw files.
By the way, it's my comparison when I decided to go for F55.
-Alexa has good color, DR, and enough resolution with heavy body and matured workflow.
-F65 has good color, DR, and excessive resolution with heavier body and limited workflow.
-F55 has good color, DR, and good resolution with a light ergonomic body and wide workflow.
-RED has little bit thin color, good DR, and better resolution choice with a light body and matured workflow.
I don't know the reality of film industry and it was a guess work to imagine the high-end cams but I think I was right