I agree. I don’t notice it riding, just when I stop after a run to check it’s still flex and not slap!I do not notice the flex while riding but I may be I’m an outlier in that regard.
I think the lack of seatstay bridge and use of clevis mount instead of a more robust rocker link are the reasons we feel flex. I can barely get it all aligned for reassembly after taking the linkages apart to lubricate bearings.
It is definitely not the real wheel itself, I’ve run mine with three wheel sets including tr37 and we are one union hoops.
That said, I’m still a big fan of the bike and don’t see another with the same benefits at this price range.