Its not condescension. Its simply being familiar with a particular style of governance because you live in said country. Most folks don't spend much time pretending to know more about Canadian, South African, Indian politics than the people who actually reside in those countries do, so why would the US be exempt from this phenomenon ?
Except US politics really isn't all that complicated. I have certainly learned nothing new here. Also, the debate started with
@entropy, who is certainly located in the US.
But more importantly, also covering this point:
I think you are quite right there. They’re expecting a prime minister and what we have is designed to be exactly not that.
I don't think anybody has been saying that. The blame for Biden concerns campaign promises that he would have known he couldn't keep (especially given his long experience), exactly because of the way American politics work. You're cynical about that, basically saying politicians will promise anything to get elected, and that that's just the way it is; but others don't agree with that stance.
Alternatively, it could also be claimed that the promises are possible and that Biden just isn't working hard enough to get Democratic senators and representatives behind his plans (being in the same party is not completely meaningless, and his plans aren't at all 'out there'); but of course none of us know which conversations are being had and what pressure is being put on people. So I don't know about that.
Finally, for what it's worth, I grew up in the Netherlands, where all governing is done through coalitions, and no party therefore ever gets exactly what it wants. Hence, parties don't campaign hard on their super specific plans, cause everyone knows they won't be able to execute them as such. So some realism in political campaigns is not beyond the realm of the possible.