Agreed. I never have noticed a "wall." Could be different in the US. Here, it's not a "speed restrictor," but rather an assist cutoff that kicks in... also at much higher speed.I’ve occasionally been able to get my SL up to to 28mph and past it. (Not too many places long enough to get up to that speed without needing to slow down for pedestrians, slower riders or stop signs.)
I haven’t noticed that “wall” at the top speeds. I have felt it if I‘ve been running at Eco or Sport, hit turbo to pass someone or top a hill and then return to a lower assist level. Then there can be lots of resistance then. It goes away after a while, I think as the cadence and torque balance with the assist.